(a) Ability to obtain resources. Except to the extent that a prospective contractor has sufficient resources or proposes to perform the contract by subcontracting, the contracting officer shall require acceptable evidence of the prospective contractor’s ability to obtain required resources (see 9.104-1(a), (e), and (f)). Acceptable evidence normally consists of a commitment or explicit arrangement, that will be in existence at the time of contract award, to rent, purchase, or otherwise acquire the needed facilities, equipment, other resources, or personnel. Consideration of a prime contractor’s compliance with limitations on subcontracting shall take into account the time period covered by the contract base period or quantities plus option periods or quantities, if such options are considered when evaluating offers for award.

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(b) Satisfactory performance record. A prospective contractor that is or recently has been seriously deficient in contract performance shall be presumed to be nonresponsible, unless the contracting officer determines that the circumstances were properly beyond the contractor’s control, or that the contractor has taken appropriate corrective action. Past failure to apply sufficient tenacity and perseverance to perform acceptably is strong evidence of nonresponsibility. Failure to meet the quality requirements of the contract is a significant factor to consider in determining satisfactory performance. The contracting officer shall consider the number of contracts involved and the extent of deficient performance in each contract when making this determination. If the pending contract requires a subcontracting plan pursuant to subpart  19.7, The Small Business Subcontracting Program, the contracting officer shall also consider the prospective contractor’s compliance with subcontracting plans under recent contracts.

(c)

(1) Affiliated concerns. Affiliated concerns (see "Concern" in 19.001 and "Small business concern" in 2.101 ) are normally considered separate entities in determining whether the concern that is to perform the contract meets the applicable standards for responsibility. However, the contracting officer shall consider the affiliate’s past performance and integrity when they may adversely affect the prospective contractor’s responsibility.

(2) Joint ventures. For a prospective contractor that is a joint venture, the contracting officer shall consider the past performance of the joint venture. If the joint venture does not demonstrate past performance for award, the contracting officer shall consider the past performance of each party to the joint venture.

(d)

(1) Small business concerns. Upon making a determination of nonresponsibility with regard to a small business concern, the contracting officer shall refer the matter to the Small Business Administration, which will decide whether to issue a Certificate of Competency (see subpart 19.6).

(2) Limitations on subcontracting. A small business that is unable to comply with the limitations on subcontracting may be considered nonresponsible (see 52.219-3, Notice of HUBZone Set-Aside or Sole Source Award; 52.219-4, Notice of Price Evaluation Preference for HUBZone Small Business Concerns; 52.219-14, Limitations on Subcontracting; 52.219-27,Notice of Set-Aside for, or Sole-Source Award to, Service-Disabled Veteran-Owned Small Business (SDVOSB) Concerns Eligible Under the SDVOSB Program; 52.219-29, Notice of Set-Aside for, or Sole-Source Award to, Economically Disadvantaged Women-Owned Small Business Concerns; and 52.219-30, Notice of Set-Aside for, or Sole Source Award to, Women-Owned Small Business Concerns Eligible Under the Women-Owned Small Business Program). A small business that has not agreed to comply with the limitations on subcontracting may be considered nonresponsive.

(a) When an offeror provides an affirmative response in paragraph (a)(1) of the provision at 52.209-5, Certification Regarding Responsibility Matters, or paragraph (h) of provision 52.212-3, the contracting officer shall-

(1) Promptly, upon receipt of offers, request such additional information from the offeror as the offeror deems necessary in order to demonstrate the offeror’s responsibility to the contracting officer (but see 9.405); and

(2) Notify, prior to proceeding with award, in accordance with agency procedures (see 9.406-3(a) and 9.407-3(a)), the agency official responsible for initiating debarment or suspension action, where an offeror indicates the existence of an indictment, charge, conviction, or civil judgment, or Federal tax delinquency in an amount that exceeds $10,000.

(b) The provision at 52.209-11, Representation by Corporations Regarding Delinquent Tax Liability or a Felony Conviction under any Federal Law, implements sections 744 and 745 of Division E of the Consolidated and Further Continuing Appropriations Act, (Pub. L. 113-235) (and similar provisions in subsequent appropriations acts). When an offeror provides an affirmative response in paragraph (b)(1) or (2) of the provision at 52.209-11 or paragraph (q)(2)(i) or (ii) of provision 52.212-3, the contracting officer shall–

(1) Promptly, upon receipt of offers, request such additional information from the offeror as the offeror deems necessary in order to demonstrate the offeror's responsibility to the contracting officer (but see 9.405);

(2) Notify, in accordance with agency procedures (see 9.406-3(a) and 9.407-3(a)), the agency official responsible for initiating debarment or suspension action; and

(3) Not award to the corporation unless an agency suspending and debarring official has considered suspension or debarment of the corporation and made a determination that suspension or debarment is not necessary to protect the interests of the Government.

(c) If the provision at 52.209-12, Certification Regarding Tax Matters, is applicable (see 9.104-7(e)), then the contracting officer shall not award any contract in an amount greater than $5.5 million, unless the offeror affirmatively certified in its offer, as required by paragraph (b)(1), (2), and (3) of the provision.

(d) Offerors who do not furnish the representation or certifications or such information as may be requested by the contracting officer shall be given an opportunity to remedy the deficiency. Failure to furnish the representation or certifications or such information may render the offeror nonresponsible.

(a)

(1) Before awarding a contract in excess of the simplified acquisition threshold, the contracting officer shall review the performance and integrity information available in the Federal Awardee Performance and Integrity Information System (FAPIIS), (available at https://www.cpars.gov), including FAPIIS information from the System for Award Management (SAM) Exclusions and the Contractor Performance Assessment Reporting System (CPARS).

(2) In accordance with 41 U.S.C. (d)(3), FAPIIS also identifies–

(i) An affiliate that is an immediate owner or subsidiary of the offeror, if any (see 52.204-17, Ownership or Control of Offeror); and

(ii) All predecessors of the offeror that held a Federal contract or grant within the last three years (see 52.204-20, Predecessor of Offeror).

(b)

(1) When making a responsibility determination, the contracting officer shall consider all the information available through FAPIIS with regard to the offeror and any immediate owner, predecessor, or subsidiary identified for that offeror in FAPIIS, as well as other past performance information on the offeror (see subpart  42.15).

(2) For evaluation of information available through FAPIIS relating to an affiliate of the offeror, see 9.104-3(c).

(3) For source selection evaluations of past performance, see 15.305(a)(2). Contracting officers shall use sound judgment in determining the weight and relevance of the information contained in FAPIIS and how it relates to the present acquisition.

(4) Since FAPIIS may contain information on any of the offeror's previous contracts and information covering a 5-year period, some of that information may not be relevant to a determination of present responsibility, e.g., a prior administrative action such as debarment, suspension, voluntary exclusion, or administrative agreement, that has expired or otherwise been resolved, or information relating to contracts for completely different products or services.

(5) Because FAPIIS is a database that provides information about prime contractors, the contracting officer posts information required to be posted about a subcontractor, such as trafficking in persons violations, to the record of the prime contractor (see 42.(h)(1)(v)). The prime contractor has the opportunity to post in FAPIIS any mitigating factors. The contracting officer shall consider any mitigating factors posted in FAPIIS by the prime contractor, such as degree of compliance by the prime contractor with the terms of FAR clause 52.222-50.

(c) If the contracting officer obtains relevant information from FAPIIS regarding criminal, civil, or administrative proceedings in connection with the award or performance of a Government contract; terminations for default or cause; determinations of nonresponsibility because the contractor does not have a satisfactory performance record or a satisfactory record of integrity and business ethics; or comparable information relating to a grant, the contracting officer shall, unless the contractor has already been debarred, suspended, or has agreed to a voluntary exclusion-

(1) Promptly request such additional information from the offeror as the offeror deems necessary in order to demonstrate the offeror’s responsibility to the contracting officer (but see 9.405); and

(2) Notify, prior to proceeding with award, in accordance with agency procedures (see 9.406-3(a) and 9.407-3(a)), the agency official responsible for initiating debarment or suspension action, if the information appears appropriate for the official’s consideration.

(d) The contracting officer shall document the contract file for each contract in excess of the simplified acquisition threshold to indicate how the information in FAPIIS was considered in any responsibility determination, as well as the action that was taken as a result of the information. A contracting officer who makes a nonresponsibility determination is required to document that information in FAPIIS in accordance with 9.105-2(b)(2).

(a) Before making a determination of responsibility, the contracting officer shall possess or obtain information sufficient to be satisfied that a prospective contractor currently meets the applicable standards in 9.104.

(b)

(1) Generally, the contracting officer shall obtain information regarding the responsibility of prospective contractors, including requesting preaward surveys when necessary (see 9.106), promptly after a bid opening or receipt of offers. However, in negotiated contracting, especially when research and development is involved, the contracting officer may obtain this information before issuing the request for proposals. Requests for information shall ordinarily be limited to information concerning-

(i) The low bidder; or

(ii) Those offerors in range for award.

(2) Preaward surveys shall be managed and conducted by the surveying activity.

(i) If the surveying activity is a contract administration office-

(A) That office shall advise the contracting officer on prospective contractors’ financial competence and credit needs; and

(B) The administrative contracting officer shall obtain from the auditor any information required concerning the adequacy of prospective contractors’ accounting systems and these systems’ suitability for use in administering the proposed type of contract.

(ii) If the surveying activity is not a contract administration office, the contracting officer shall obtain from the auditor any information required concerning prospective contractors’ financial competence and credit needs, the adequacy of their accounting systems, and these systems’ suitability for use in administering the proposed type of contract.

(3) Information on financial resources and performance capability shall be obtained or updated on as current a basis as is feasible up to the date of award.

(c) In making the determination of responsibility, the contracting officer shall consider information available through FAPIIS (see 9.104-6) with regard to the offeror and any immediate owner, predecessor, or subsidiary identified for that offeror in FAPIIS, including information that is linked to FAPIIS such as from SAM, and CPARS, as well as any other relevant past performance information on the offeror (see 9.104-1(c) and subpart  42.15). In addition, the contracting officer should use the following sources of information to support such determinations:

(1) Records and experience data, including verifiable knowledge of personnel within the contracting office, audit offices, contract administration offices, and other contracting offices.

(2) The prospective contractor-including bid or proposal information (including the certification at 52.209-5 or 52.212-3(h) (see 9.104-5)), questionnaire replies, financial data, information on production equipment, and personnel information.

(3) Commercial sources of supplier information of a type offered to buyers in the private sector.

(4) Preaward survey reports (see 9.106).

(5) Other sources such as publications; suppliers, subcontractors, and customers of the prospective contractor; financial institutions; Government agencies; and business and trade associations.

(d) Contracting offices and cognizant contract administration offices that become aware of circumstances casting doubt on a contractor’s ability to perform contracts successfully shall promptly exchange relevant information.

(a) Determinations.

(1) The contracting officer’s signing of a contract constitutes a determination that the prospective contractor is responsible with respect to that contract. When an offer on which an award would otherwise be made is rejected because the prospective contractor is found to be nonresponsible, the contracting officer shall make, sign, and place in the contract file a determination of nonresponsibility, which shall state the basis for the determination.

(2) If the contracting officer determines that a responsive small business lacks certain elements of responsibility, the contracting officer shall comply with the procedures in subpart  19.6. When a Certificate of Competency is issued for a small business concern (see subpart  19.6), the contracting officer shall accept the Small Business Administration’s decision to issue a Certificate of Competency and award the contract to the concern.

(b) Support documentation.

(1) Documents and reports supporting a determination of responsibility or nonresponsibility, including any preaward survey reports, the use of FAPIIS information (see 9.104-6), and any applicable Certificate of Competency, must be included in the contract file.

(2)

(i) The contracting officer shall document the determination of nonresponsibility in FAPIIS (available at https://www.cpars.gov) if-

(A) The contract is valued at more than the simplified acquisition threshold;

(B) The determination of nonresponsibility is based on lack of satisfactory performance record or satisfactory record of integrity and business ethics; and

(C) The Small Business Administration does not issue a Certificate of Competency.

(ii) The contracting officer is responsible for the timely submission, within 3 working days, and sufficiency, and accuracy of the documentation regarding the nonresponsibility determination.

(iii) As required by section of the Supplemental Appropriations Act, (Pub. L. 111-212), all information posted in FAPIIS on or after April 15, , except past performance reviews, will be publicly available. FAPIIS consists of two segments-

(A) The non-public segment, into which Government officials and contractors post information, which can only be viewed by-

(1) Government personnel and authorized users performing business on behalf of the Government; or

(2) An offeror or contractor, when viewing data on itself; and

(B) The publicly-available segment, to which all data in the non-public segment of FAPIIS is automatically transferred after a waiting period of 14 calendar days, except for-

(1) Past performance reviews required by subpart 42.15;

(2) Information that was entered prior to April 15,; or

(3) Information that is withdrawn during the 14-calendar-day waiting period by the Government official who posted it in accordance with paragraph (b)(2)(iv) of this section.

(iv) The contracting officer, or any other Government official, shall not post any information in the non-public segment of FAPIIS that is covered by a disclosure exemption under the Freedom of Information Act. If the contractor asserts within 7 calendar days, to the Government official who posted the information, that some of the information posted to the non-public segment of FAPIIS is covered by a disclosure exemption under the Freedom of Information Act, the Government official who posted the information must within 7 calendar days remove the posting from FAPIIS and resolve the issue in accordance with agency Freedom of Information Act procedures, prior to reposting the releasable information.

(a) Agencies may not enforce any QPL, QML, or QBL without first complying with the requirements of 9.202(a). However, qualification requirements themselves, whether or not previously embodied in a in a QPL, QML, or QBL, may be enforced without regard to 9.202(a) if they are in either of the following categories:

(1) Any qualification requirement established by statute prior to October 30,, for civilian agencies (not including NASA); or

(2) Any qualification requirement established by statute or administrative action prior to October 19,, for DoD or NASA. Qualification requirements established after the above dates must comply with 9.202(a) to be enforceable.

(b) Except when the agency head or designee determines that an emergency exists, whenever an agency elects, whether before or after award, not to enforce a qualification requirement which it established, the requirement may not thereafter be enforced unless the agency complies with 9.202(a).

(c) If a qualification requirement applies, the contracting officer need consider only those offers identified as meeting the requirement or included on the applicable QPL, QML, or QBL, unless an offeror can satisfactorily demonstrate to the contracting officer that it or its product or its subcontractor or its product can meet the standards established for qualification before the date specified for award.

(d) If a product subject to a qualification requirement is to be acquired as a component of an end item, the contracting officer must ensure that all such components and their qualification requirements are properly identified in the solicitation since the product or source must meet the standards specified for qualification before award.

(e) In acquisitions subject to qualification requirements, the contracting officer shall take the following steps:

(1) Use presolicitation notices in appropriate cases to advise potential suppliers before issuing solicitations involving qualification requirements. The notices shall identify the specification containing the qualification requirement and establish an allowable time period, consistent with delivery requirements, for prospective offerors to demonstrate their abilities to meet the standards specified for qualification. The notice shall be publicized in accordance with 5.204. Whether or not a presolicitation notice is used, the general synopsizing requirements of subpart  5.2 apply.

(2) Distribute solicitations to prospective contractors whether or not they have been identified as meeting applicable qualification requirements.

(3) When appropriate, request in accordance with agency procedures that a qualification requirement not be enforced in a particular acquisition and, if granted, so specify in the solicitation (see 9.206-1(b)).

(4) Forward requests from potential suppliers for information on a qualification requirement to the agency activity responsible for establishing the requirement.

(5) Allow the maximum time, consistent with delivery requirements, between issuing the solicitation and the contract award. As a minimum, contracting officers shall comply with the time frames specified in 5.203 when applicable.

(a) It is the suspending and debarring official's responsibility to determine whether debarment is in the Government's interest. The suspending and debarring official may, in the public interest, debar a contractor for any of the causes in 9.406-3. The existence of a cause for debarment, however, does not necessarily require that the contractor be debarred; the seriousness of the contractor's acts or omissions and any remedial measures, mitigating factors, or aggravating factors should be considered in making any debarment decision. Before arriving at any debarment decision, the suspending and debarring official should consider factors such as the following (some of the factors below could apply to individuals such as contractors that are individuals, and are so marked):

(1) Whether the contractor had effective standards of conduct and internal control systems in place at the time of the activity which constitutes cause for debarment or had adopted such procedures prior to any Government investigation of the activity cited as a cause for debarment.

(2) Whether the contractor (including an individual) brought the activity cited as a cause for debarment to the attention of the appropriate Government agency in a timely manner.

(3) Whether the contractor has fully investigated the circumstances surrounding the cause for debarment (or the individual cooperated with the investigation) and, if so, made the result of the investigation available to the suspending and debarring official.

(4) Whether the contractor (including an individual) cooperated fully with Government agencies during the investigation and any court or administrative action.

(5) Whether the contractor (including an individual) has paid or has agreed to pay all criminal, civil, and administrative liability for the improper activity, including any investigative or administrative costs incurred by the Government, and has made or agreed to make full restitution.

(6) Whether the contractor has taken appropriate disciplinary action against the individuals responsible for the activity which constitutes cause for debarment.

(7) Whether the contractor (including an individual) has implemented or agreed to implement remedial measures, including any identified by the Government.

(8)

(i) Whether the contractor has instituted or agreed to institute new or revised review and control procedures, ethics training, or other relevant training programs.

(ii) For an individual, whether the individual has attended relevant remediation training.

(9) Whether the contractor (including an individual) has had adequate time to eliminate the circumstances that led to the cause for debarment.

(10)

(i) Whether the contractor's management recognizes, accepts, and understands the seriousness of the misconduct giving rise to the cause for debarment and has implemented programs to prevent recurrence.

(ii) For an individual, whether the individual recognizes, accepts, and understands the seriousness of the misconduct giving rise to the cause for debarment and has adopted practices to prevent recurrence.

(11) Whether the contractor (including an individual) has a pattern or prior history of wrongdoing, the frequency of incidents and/or duration of the wrongdoing, and the actual or potential harm or impact that results, or may result, from the wrongdoing.

(12) Whether and to what extent the contractor (including an individual) planned, initiated, or carried out the wrongdoing, and the kind of positions within the contractor's organization held by the individual involved in the wrongdoing.

(13) Whether the wrongdoing was pervasive within the contractor's organization.

(14) Whether the individual or the contractor's principals tolerated the offense.

(15) Whether the contractor (including an individual) is or has been excluded or disqualified by an agency of the Federal Government or has not been allowed to participate in State or local contracts or assistance agreements on a basis of conduct similar to one or more of the causes for debarment specified in this subpart.

(16) Whether the contractor (including an individual) has entered into an administrative agreement with a Federal agency or a similar agreement with a State or local government that is not Governmentwide but is based on conduct similar to one or more of the causes for debarment specified in this subpart.

(17) Whether there are any other factors to consider for the contractor (including an individual) appropriate to the circumstances of a particular case.

(b) The existence or nonexistence of any aggravating or mitigating factors or remedial measures such as set forth in paragraph (a) of this section is not necessarily determinative of a contractor's present responsibility. Accordingly, if a cause for debarment exists, the contractor has the burden of demonstrating, to the satisfaction of the suspending and debarring official, its present responsibility and that debarment is not necessary.

(c) Debarment constitutes debarment of all divisions or other organizational elements of the contractor, unless the debarment decision is limited by its terms to specific divisions, organizational elements, or commodities. The suspending and debarring official may extend the debarment decision to include any affiliates of the contractor if they are—

(1) Specifically named; and

(2) Given written notice of the proposed debarment and an opportunity to respond (see 9.406-3(c)).

(d) A contractor's debarment, or proposed debarment, shall be effective throughout the executive branch of the Government, unless the agency head or a designee (except see 26.505(e)) states in writing the compelling reasons justifying continued business dealings between that agency and the contractor.

(e)

(1) When the suspending and debarring official has authority to debar contractors from both contracts pursuant to the Federal Acquisition Regulation in this chapter and contracts for the purchase of Federal personal property pursuant to the Federal Management Regulation (FMR) in 41 CFR part 102-38, that official shall consider simultaneously debarring the contractor from the award of acquisition contracts and from the purchase of Federal personal property.

(2) When debarring a contractor from the award of acquisition contracts and from the purchase of Federal personal property, the debarment notice shall so indicate and the appropriate FAR and FMR citations shall be included.

The suspending and debarring official may debar-

(a) A contractor for a conviction of or civil judgment for-

(1) Commission of fraud or a criminal offense in connection with-

(i) Obtaining;

(ii) Attempting to obtain; or

(iii) Performing a public contract or subcontract.

(2) Violation of Federal or State antitrust statutes relating to the submission of offers;

(3) Commission of embezzlement, theft, forgery, bribery, falsification or destruction of records, making false statements, tax evasion, violating Federal criminal tax laws, or receiving stolen property;

(4) Intentionally affixing a label bearing a "Made in America" inscription (or any inscription having the same meaning) to a product sold in or shipped to the United States or its outlying areas, when the product was not made in the United States or its outlying areas (see Section 202 of the Defense Production Act (Public Law102-558)); or

(5) Commission of any other offense indicating a lack of business integrity or business honesty that seriously and directly affects the present responsibility of a Government contractor or subcontractor.

(b)

(1) A contractor, based upon a preponderance of the evidence, for any of the following-

(i) Violation of the terms of a Government contract or subcontract so serious as to justify debarment, such as-

(A) Willful failure to perform in accordance with the terms of one or more contracts; or

(B) A history of failure to perform, or of unsatisfactory performance of, one or more contracts.

(ii) Violations of 41 U.S.C. chapter 81, Drug-Free Workplace, as indicated by-

(A) Failure to comply with the requirements of the clause at 52.226-7, Drug-Free Workplace; or

(B) Such a number of contractor employees convicted of violations of criminal drug statutes occurring in the workplace as to indicate that the contractor has failed to make a good faith effort to provide a drug-free workplace (see 26.504).

(iii) Intentionally affixing a label bearing a "Made in America" inscription (or any inscription having the same meaning) to a product sold in or shipped to the United States or its outlying areas, when the product was not made in the United States or its outlying areas (see Section 202 of the Defense Production Act (Public Law102-558)).

(iv) Commission of an unfair trade practice as defined in 9.403 (see Section 201 of the Defense Production Act (Pub.L.102-558)).

(v) Delinquent Federal taxes in an amount that exceeds $10;000.

(A) Federal taxes are considered delinquent for purposes of this provision if both of the following criteria apply:

(1) The tax liability is finally determined. The liability is finally determined if it has been assessed. A liability is not finally determined if there is a pending administrative or judicial challenge. In the case of a judicial challenge to the liability, the liability is not finally determined until all judicial appeal rights have been exhausted.

(2) The taxpayer is delinquent in making payment. A taxpayer is delinquent if the taxpayer has failed to pay the tax liability when full payment was due and required. A taxpayer is not delinquent in cases where enforced collection action is precluded.

(B) Examples.

(1) The taxpayer has received a statutory notice of deficiency, under I.R.C. §, which entitles the taxpayer to seek Tax Court review of a proposed tax deficiency. This is not a delinquent tax because it is not a final tax liability. Should the taxpayer seek Tax Court review, this will not be a final tax liability until the taxpayer has exercised all judicial appeal rights.

(2) The IRS has filed a notice of Federal tax lien with respect to an assessed tax liability, and the taxpayer has been issued a notice under I.R.C. § entitling the taxpayer to request a hearing with the IRS Office of Appeals contesting the lien filing, and to further appeal to the Tax Court if the IRS determines to sustain the lien filing. In the course of the hearing, the taxpayer is entitled to contest the underlying tax liability because the taxpayer has had no prior opportunity to contest the liability. This is not a delinquent tax because it is not a final tax liability. Should the taxpayer seek tax court review, this will not be a final tax liability until the taxpayer has exercised all judicial appeal rights.

(3) The taxpayer has entered into an installment agreement pursuant to I.R.C. §. The taxpayer is making timely payments and is in full compliance with the agreement terms. The taxpayer is not delinquent because the taxpayer is not currently required to make full payment.

(4) The taxpayer has filed for bankruptcy protection. The taxpayer is not delinquent because enforced collection action is stayed under 11 U.S.C. 362 (the Bankruptcy Code).

(vi) Knowing failure by a principal, until 3 years after final payment on any Government contract awarded to the contractor, to timely disclose to the Government, in connection with the award, performance, or closeout of the contract or a subcontract thereunder, credible evidence of-

(A) Violation of Federal criminal law involving fraud, conflict of interest, bribery, or gratuity violations found in Title 18 of the United States Code;

(B) Violation of the civil False Claims Act ( 31 U.S.C. - ); or

(C) Significant overpayment(s) on the contract, other than overpayments resulting from contract financing payments as defined in 32.001.

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(vii) Determination of a false certification under 52.209-13, Violation of Arms Control Treaties or Agreements-Certification.

(2) A contractor, based on a determination by the Secretary of Homeland Security or the Attorney General of the United States, that the contractor is not in compliance with Immigration and Nationality Act employment provisions (see Executive Order , as amended by Executive Order ). Such determination is not reviewable in the debarment proceedings.

(c) A contractor or subcontractor based on any other cause of so serious or compelling a nature that it affects the present responsibility of the contractor or subcontractor.

(a) Investigation and referral. Agencies shall establish procedures for the prompt reporting, investigation, and referral to the suspending and debarring official of matters appropriate for that official’s consideration.

(b) Decision-making process.

(1) Agencies shall establish procedures governing the debarment decision-making process that are as informal as is practicable, consistent with principles of fundamental fairness. These procedures shall afford the contractor (and any specifically named affiliates) an opportunity to submit, in person, in writing, or through a representative, information and argument in opposition to the proposed debarment. If the suspending and debarring official extends the opportunity for the contractor to submit material in opposition, then the official should also give a deadline for submission of materials. The suspending and debarring official may use flexible procedures to allow a contractor to present matters in opposition in person or remotely through appropriate technology; if so, the suspending and debarring official should change the notice in paragraph (c)(3)(iv) of this section to include those flexible procedures.

(2) In actions not based upon a conviction or civil judgment, if it is found that the contractor’s submission in opposition raises a genuine dispute over facts material to the proposed debarment, agencies shall also-

(i) Afford the contractor an opportunity to appear with counsel, submit documentary evidence, present witnesses, and confront any person the agency presents; and

(ii) Make a transcribed record of the proceedings and make it available at cost to the contractor upon request, unless the contractor and the agency, by mutual agreement, waive the requirement for a transcript.

(c) Notice of proposal to debar. A notice of proposed debarment shall be issued by the suspending and debarring official to the contractor and any specifically named affiliates.

(1) The written notice shall be sent—

(i) By U.S. mail or private delivery service to the last known street address, with delivery notification service;

(ii) By to the point of contact address in the contractor's SAM registration, if any, or to the last known address as confirmed by the agency; or

(iii) By certified mail to the last known street address with return receipt requested.

(2) The notice shall be sent—

(i) To the contractor, the contractor's identified counsel for purposes of the administrative proceedings, or the contractor's agent for service of process; and

(ii) For each specifically named affiliate, to the affiliate itself, the affiliate's identified counsel for purposes of the administrative proceedings, or the affiliate's agent for service of process.

(3) The notice shall state—

(i) That debarment is being considered;

(ii) The reasons for the proposed debarment in terms sufficient to put the contractor on notice of the conduct or transaction(s) upon which it is based;

(iii) The cause(s) relied upon under 9.406-2 for proposing debarment;

(iv) That, within 30 days after receipt of the notice, the contractor may submit, in person, in writing, or through a representative, information and argument in opposition to the proposed debarment, including any additional specific information that raises a genuine dispute over the material facts;

(v) The agency's procedures governing debarment decision making;

(vi) The effect of the issuance of the notice of proposed debarment;

(vii) The potential effect of an actual debarment;

(viii) That in addition to any information and argument in opposition to a proposed debarment, the contractor must identify—

(A) Specific facts that contradict the statements contained in the notice of proposed debarment. Include any information about any of the factors listed in 9.406-1(a). A general denial is insufficient to raise a genuine dispute over facts material to the proposed debarment;

(B) All existing, proposed, or prior exclusions and all similar actions taken by Federal, State, or local agencies, including administrative agreements that affect only those agencies;

(C) All criminal and civil proceedings not included in the notice of proposed debarment that grew out of facts relevant to the cause(s) stated in the notice; and

(D) All of the contractor's affiliates; and

(ix) That if the contractor fails to disclose the information in paragraph (c)(3)(viii) of this section, or provides false information, the agency taking the action may seek further criminal, civil, or administrative action against the contractor, as appropriate.

(d) Suspending and debarring official’s decision.

(1) In actions based upon a conviction or civil judgment, or in which there is no genuine dispute over material facts, the suspending and debarring official shall make a decision on the basis of all the information in the administrative record, including any submission made by the contractor. If no suspension is in effect, the decision shall be made within 45 days from the date that the official administrative record is closed, unless the suspending and debarring official extends this period for good cause. The official record closes upon the expiration of the contractor's time to submit information and argument in opposition, including any extensions (see paragraph (b)(1) of this section).

(2)

(i) In actions in which additional proceedings are necessary as to disputed material facts, written findings of fact shall be prepared. The suspending and debarring official shall base the decision on the facts as found, together with any information and argument submitted by the contractor and any other information in the administrative record.

(ii) The suspending and debarring official may refer matters involving disputed material facts to another official for findings of fact. The suspending and debarring official may reject any such findings, in whole or in part, only after specifically determining them to be arbitrary and capricious or clearly erroneous.

(iii) The suspending and debarring official's decision shall be made after the conclusion of the proceedings with respect to disputed facts.

(3) In any action in which the proposed debarment is not based upon a conviction or civil judgment, the cause for debarment must be established by a preponderance of the evidence.

(e) Notice of suspending and debarring official's decision.

(1) If the suspending and debarring official decides to impose debarment, the contractor and any affiliates involved shall be given prompt notice using the procedures in paragraphs (c)(1) and (2) of this section—

(i) Referring to the notice of proposed debarment;

(ii) Specifying the reasons for debarment;

(iii) Stating the period of debarment, including effective dates; and

(iv) Advising that the debarment is effective throughout the executive branch of the Government unless the head of an agency or a designee makes the statement called for by 9.406-1(d).

(2) If debarment is not imposed, the suspending and debarring official shall promptly notify the contractor and any affiliates involved, using the procedures in paragraphs (c)(1) and (2) of this section.

(f) Administrative agreements.

(1) If the contractor enters into an administrative agreement with the Government in order to resolve a debarment or potential debarment proceeding, the suspending and debarring official shall access the website (available at https://www.cpars.gov, then select FAPIIS), enter the requested information, and upload documentation reflecting the administrative agreement.

(2) The suspending and debarring official is responsible for the timely and accurate submission of documentation reflecting the administrative agreement. The submission should be made within 3 working days.

(3) With regard to information that may be covered by a disclosure exemption under the Freedom of Information Act, the suspending and debarring official shall follow the procedures at 9.105-2(b)(2)(iv).

(g) Voluntary exclusions.

(1) If the contractor enters into a voluntary exclusion with the Government in order to resolve a debarment or potential debarment matter, the suspending and debarring official shall access the website (available at https://www.sam.gov) and enter the requested information into the exclusions section of SAM (see 9.404(c)(3)).

(2) The suspending and debarring official is responsible for the timely and accurate submission of documentation reflecting the voluntary exclusion. The submission should be made within 3 working days.

(3) Regarding information that may be covered by a disclosure exemption under the Freedom of Information Act, the suspending and debarring official shall follow the procedures at 9.105-2(b)(2)(iv).

(h) Pre-notice letters. Prior to initiating a proposed debarment, a pre-notice letter may be issued at the discretion of the agency suspending and debarring official. A pre-notice letter is not required to initiate debarment under this subpart. (See 9.403.)

(a) The suspending and debarring official may, in the public interest, suspend a contractor for any of the causes in 9.407-2, using the procedures in 9.407-3.

(b)

(1) Suspension is a serious action to be imposed on the basis of adequate evidence, pending the completion of an investigation or legal proceedings, when it has been determined that immediate action is necessary to protect the Government's interest. In deciding whether immediate action is necessary to protect the Government's interest, the suspending and debarring official has wide discretion. The suspending and debarring official may infer the necessity for immediate action to protect the Government's interest either from the nature of the circumstances giving rise to a cause for suspension or from potential business relationships or involvement with a program of the Federal Government. In assessing the adequacy of the evidence, agencies should consider how much information is available, how credible it is given the circumstances, whether or not important allegations are corroborated, and what inferences can reasonably be drawn as a result. This assessment should include an examination of basic documents such as contracts, inspection reports, and correspondence. An indictment or other official findings by Federal, State, or local bodies that determine factual and/or legal matters, constitutes adequate evidence for purposes of suspension actions.

(2) The existence of a cause for suspension does not necessarily require that the contractor be suspended. The suspending and debarring official should consider the seriousness of the contractor's acts or omissions and may, but is not required to, consider remedial measures, mitigating factors, or aggravating factors, such as those in 9.406-1(a). A contractor has the burden of promptly presenting to the suspending and debarring official evidence of remedial measures or mitigating factors when it has reason to know that a cause for suspension exists. The existence or nonexistence of any remedial measures or aggravating or mitigating factors is not necessarily determinative of a contractor's present responsibility.

(c) Suspension constitutes suspension of all divisions or other organizational elements of the contractor, unless the suspension decision is limited by its terms to specific divisions, organizational elements, or commodities. The suspending and debarring official may extend the suspension decision to include any affiliates of the contractor if they are-

(1) Specifically named; and

(2) Given written notice of the suspension and an opportunity to respond (see 9.407-3(c)).

(d) A contractor’s suspension shall be effective throughout the executive branch of the Government, unless the agency head or a designee (except see 26.505(e)) states in writing the compelling reasons justifying continued business dealings between that agency and the contractor.

(e)

(1) When the suspending and debarring official has authority to suspend contractors from both contracts pursuant to the Federal Acquisition Regulation in this chapter and contracts for the purchase of Federal personal property pursuant to Federal Management Regulation (FMR) in 41 CFR part 102-38, that official shall consider simultaneously suspending the contractor from the award of acquisition contracts and from the purchase of Federal personal property.

(2) When suspending a contractor from the award of acquisition contracts and from the purchase of Federal personal property, the suspension notice shall so indicate and the appropriate FAR and FMR citations shall be included.

(a) Investigation and referral. Agencies shall establish procedures for the prompt reporting, investigation, and referral to the suspending and debarring official of matters appropriate for that official’s consideration.

(b) Decision-making process.

(1) Agencies shall establish procedures governing the suspension decision-making process that are as informal as is practicable, consistent with principles of fundamental fairness. These procedures shall afford the contractor (and any specifically named affiliates) an opportunity, following the imposition of suspension, to submit, in person, in writing, or through a representative, information and argument in opposition to the suspension. If the suspending and debarring official extends the opportunity for the contractor to submit material in opposition, then the official should also give a deadline for submission of materials. The suspending and debarring official may use the flexible procedures in 9.406-3(b)(1); if so, the suspending and debarring official should change the notice in paragraph (c)(5) of this section to include those flexible procedures.

(2) In actions not based on an indictment, if it is found that the contractor’s submission in opposition raises a genuine dispute over facts material to the suspension and if no determination has been made, on the basis of advice from the Department of Justice, a U.S. Attorney's office, State attorney general's office, or a State or local prosecutor's office, that substantial interests of the Government in pending or contemplated legal proceedings based on the same facts as the suspension would be prejudiced, agencies shall also-

(i) Afford the contractor an opportunity to appear with counsel, submit documentary evidence, present witnesses, and confront any person the agency presents; and

(ii) Make a transcribed record of the proceedings and make it available at cost to the contractor upon request, unless the contractor and the agency, by mutual agreement, waive the requirement for a transcript.

(c) Notice of suspension. When a contractor and any specifically named affiliates are suspended, they shall be immediately advised using the procedures in 9.406-3(c)(1) and (2)—

(1) That they have been suspended and that the suspension is based on an indictment or other adequate evidence that the contractor has committed irregularities–

(i) Of a serious nature in business dealings with the Government; or

(ii) Seriously reflecting on the propriety of further Government dealings with the contractor—any such irregularities shall be described in terms sufficient to place the contractor on notice without disclosing the Government's evidence;

(2) That the suspension is for a temporary period pending the completion of an investigation and such legal proceedings as may ensue;

(3) Of the cause(s) relied upon under 9.407-2 for imposing suspension;

(4) Of the effect of the suspension;

(5) That, within 30 days after receipt of the notice, the contractor may submit, in person, in writing, or through a representative, information and argument in opposition to the suspension, including any additional specific information that raises a genuine dispute over the material facts;

(6) That additional proceedings to determine disputed material facts will be conducted unless–

(i) The action is based on an indictment; or

(ii) A determination is made, on the basis of advice by the Department of Justice, a U.S. Attorney's office, State attorney general's office, or a State or local prosecutor's office, that the substantial interests of the Government in pending or contemplated legal proceedings based on the same facts as the suspension would be prejudiced;

(7) That, in addition to any information and argument in opposition to a suspension, the contractor must identify–

(i) Specific facts that contradict the statements contained in the notice of suspension. Include any information about any of the factors listed in 9.406-1(a). A general denial is insufficient to raise a genuine dispute over facts material to the suspension;

(ii) All existing, proposed, or prior exclusions and all similar actions taken by Federal, State, or local agencies, including administrative agreements that affect only those agencies;

(iii) All criminal and civil proceedings not included in the notice of suspension that grew out of facts relevant to the cause(s) stated in the notice; and

(iv) All of the contractor's affiliates; and

(8) That if the contractor fails to disclose the information in paragraph (c)(7) of this section or provides false information, the agency taking the action may seek further criminal, civil, or administrative action against the contractor, as appropriate.

(d) Suspending and debarring official’s decision.

(1) The suspending and debarring official's decision shall be based on all the information in the administrative record, including any submission made by the contractor, for actions—

(i) Based on an indictment;

(ii) In which the contractor's submission does not raise a genuine dispute over material facts; or

(iii) In which additional proceedings to determine disputed material facts have been denied on the basis of advice from the Department of Justice, a U.S. Attorney's office, State attorney general's office, or a State or local prosecutor's office.

(2)

(i) In actions in which additional proceedings are necessary as to disputed material facts, written findings of fact shall be prepared. The suspending and debarring official shall base the decision on the facts as found, together with any information and argument submitted by the contractor and any other information in the administrative record.

(ii) Thesuspending and debarring official may refer matters involving disputed material facts to another official for findings of fact. The suspending and debarring official may reject any such findings, in whole or in part, only after specifically determining them to be arbitrary and capricious or clearly erroneous.

(iii) The suspending and debarring official's decision shall be made after the conclusion of the proceedings with respect to disputed facts.

(3) The suspending and debarring official may modify or terminate the suspension or leave it in force (for example, see 9.406-4(c) for the reasons for reducing the period or extent of debarment). However, a decision to modify or terminate the suspension shall be without prejudice to the subsequent imposition of—

(i) Suspension by any other agency; or

(ii) Debarment by any agency.

(4) Prompt written notice of the suspending and debarring official's decision shall be sent to the contractor and any affiliates involved, using the procedures in 9.406-3(c)(1) and (2).

(e) Administrative agreement.

(1) If the contractor enters into an administrative agreement with the Government in order to resolve a suspension or potential suspension proceeding, the suspending and debarring official shall access the website (available at https://www.cpars.gov, then select FAPIIS), enter the requested information, and upload documentation reflecting the administrative agreement.

(2) The suspending and debarring official is responsible for the timely and accurate submission of documentation reflecting the administrative agreement. The submission should be made within 3 working days.

(3) With regard to information that may be covered by a disclosure exemption under the Freedom of Information Act, the suspending and debarring official shall follow the procedures at 9.105-2(b)(2)(iv).

(f) Voluntary exclusion.

(1) If the contractor enters into a voluntary exclusion with the Government in order to resolve a suspension or potential suspension proceeding, the suspending and debarring official shall access the website (available at https://www.sam.gov) and enter the requested information into the exclusions section of SAM (see 9.404(c)(3)).

(2) The suspending and debarring official is responsible for the timely and accurate submission of documentation reflecting the voluntary exclusion. The submission should be made within 3 working days.

(3) Regarding information that may be covered by a disclosure exemption under the Freedom of Information Act, the suspending and debarring official shall follow the procedures at 9.105-2(b)(2)(iv).

(g) Pre-notice letter. Prior to initiating a suspension, a pre-notice letter may be issued at the discretion of the agency suspending and debarring official. A pre-notice letter is not required to initiate suspension under this subpart. (See 9.403.)

(a)

(1) If a contractor prepares and furnishes complete specifications covering nondevelopmental items, to be used in a competitive acquisition, that contractor shall not be allowed to furnish these items, either as a prime contractor or as a subcontractor, for a reasonable period of time including, at least, the duration of the initial production contract. The restriction in this paragraph (a)(1) shall not apply to-

(i) Contractors that furnish at Government request specifications or data regarding a product they provide, even though the specifications or data may have been paid for separately or in the price of the product; or

(ii) Situations in which contractors, acting as industry representatives, help Government agencies prepare, refine, or coordinate specifications, regardless of source, provided this assistance is supervised and controlled by Government representatives.

(2) If a single contractor drafts complete specifications for nondevelopmental equipment, it should be eliminated for a reasonable time from competition for production based on the specifications. This should be done in order to avoid a situation in which the contractor could draft specifications favoring its own products or capabilities. In this way the Government can be assured of getting unbiased advice as to the content of the specifications and can avoid allegations of favoritism in the award of production contracts.

(3) In development work, it is normal to select firms that have done the most advanced work in the field. These firms can be expected to design and develop around their own prior knowledge. Development contractors can frequently start production earlier and more knowledgeably than firms that did not participate in the development, and this can affect the time and quality of production, both of which are important to the Government. In many instances the Government may have financed the development. Thus, while the development contractor has a competitive advantage, it is an unavoidable one that is not considered unfair; hence no prohibition should be imposed.

(b)

(1) If a contractor prepares, or assists in preparing, a work statement to be used in competitively acquiring a system or services-or provides material leading directly, predictably, and without delay to such a work statement-that contractor may not supply the system, major components of the system, or the services unless-

(i) It is the sole source;

(ii) It has participated in the development and design work; or

(iii) More than one contractor has been involved in preparing the work statement.

(2) Agencies should normally prepare their own work statements. When contractor assistance is necessary, the contractor might often be in a position to favor its own products or capabilities. To overcome the possibility of bias, contractors are prohibited from supplying a system or services acquired on the basis of work statements growing out of their services, unless excepted in paragraph (b)(1) of this section.

(3) For the reasons given in paragraph (a)(3) of this section, no prohibitions are imposed on development and design contractors.

Driveshaft Angle Explained

This video will demonstrate the proper angles for a drive shaft in a stock Jeep or Truck and how the rules change when you add a suspension lift. 

The video below demonstrates what is happening to the shaft at different angles, how improper angles can cause speed oscillations, and it focuses more on 2WD vehicles and applications that are not lifted Jeeps and trucks. Plus it's just down right fun to watch. As the title screen suggests, in many ways it is a better driveshaft video! 

The article below offers an in depth explanation of universal joint operation at angle. Specifically we are focusing on drive shaft angle on lifted trucks and Jeeps. Read if you want to fully understand why drive line geometry is important and how it affects the type of shaft required. If you are looking for guidance on measuring angles, read our guide to measuring drive shaft angles.

O.K. so now you've done it. You put that lift in your vehicle or changed the engine, transmission or transfer case or differential maybe all of the above and now your go anywhere four wheel drive baby rides like a out of balance washing machine. Or now that you've got all that raw power & torque you keep breaking your drive shaft. What do you do? The lift kit manufacturer may tell you one thing and the local drive line shop or mechanic will tell you another. You certainly haven't put this much time, effort and money into creating the ultimate 4X4 to live in fear of the possible catastrophic consequences which can come about (usually at the worst possible moment) from neglecting drive line considerations.

So what do you do? Who do you believe? Larger joints? Possibly a C.V.? Quite frankly, only YOU can answer these questions. As with many problems in life the solution can usually be found by arming yourself with information. Unfortunately for you there is a lot of misinformation out there especially regarding proper u-joint angles. I hope to clear up a lot of this here. Please bear in mind that we are not working with an exact science. Some of the time things that in theory should work, do not, and other times people seem to be happy with a drive-line that by all standards should cause a horrible vibration or short life. Although your chances for success are greater if you do your homework and design around established principles.

My opinions and recommendations are based on numerous sources of information and many years of personal experience. By no means do I know all there is to know about drive lines (or any thing else). The intent here is to give broad general information, realizing that for the most part we are dealing with highly modified vehicles, requiring other than factory approved solutions.

In addition to a straight and properly balanced driveline, proper geometry is the most important design factor to consider when smoothness of operation, ultimate strength, and long life are desired.

If you are like me, rather than relying on just what someone may tell you. You tend to believe something more readily if you have a basic understanding of the principles involved. It is very important that you understand the concept of non-uniform velocity of your drive line caused the u-joints working through an angle:

If you were to watch a u-joint move through an angle (the operating angle) from an end view . You would see that the joint in the driven shaft has to move through an ellipse. Because the joint has to move through each of the quadrants of this elliptical path in a fixed amount of time, the velocity or surface speed of the driven shaft increases & decreases 2 times per. revolution.

With a conventional two joint drive shaft, if your second u-joint has an equal or intersecting angle, The second u-joint will be decelerating at the same time and at very near the same rate that the first u-joint is accelerating, resulting in a smooth power flow through to your pinion.

Now I hope you noticed I stated "very near" when describing this cancellation of non-uniform velocities. this is because the rates of acceleration and deceleration, minimum and maximum velocity, are NOT reciprocal numbers. Min./Max. velocities are a function of the cosine of the operating angle. If for example, to make the numbers easy, the cosine of the angle were .90 and the velocity on the driving shaft were 100 F.P.S. the min. velocity would be 90 F.P.S. and the max velocity would be 111 F.P.S. It is for this reason that on your drive shaft there is an upper limit to how steep you can run a drive shaft. Even with equal or intersecting angles.

So, How steep can you run a drive shaft? Again, this is entirely up to you. However, most manufacturers, such as Dana/Spicer, recommend a maximum of 7 degrees. I personally believe they are conservative (they have to be). I also think they base their recommendations on the math for the largest semi-truck sized driveline and call it good for every thing else (which it would be). Doing the math for an automotive sized driveline, using a 4" swing diameter and assuming the transfer case out-put and pinion shafts are parallel, the actual cosine for an angle of 15 degrees. I calculate the result of the net difference in linear distance traveled through the arc of each of the u-joints' path, to be roughly ." per occurrence . I believe there are enough clearances in the universal joint , the slip yoke & spline stub along with a torsional modulus of elasticity in the tubing and other components to accommodate this. Beyond this point the the power train components must themselves flex and distort to allow for this extra motion. This repetitive and continuous flexing will fatigue these components and cause premature failure.

There are other factors to consider though. Beginning with what you are willing to live with. Bear in mind that with a driveline pushed to this 15 degree limit you may notice a slight (slight can be a matter of definition) vibration on smooth highway at about 45-50 M.P.H. when you flutter the gas just right. Most people can live with this. When in doubt or if you are near this upper limit, I recommend that you install a double cardan (CV) type drive shaft.

The geometry you need to maintain with a double cardan drive shaft is different from that of a conventional 2 joint driveline. In many cases, the cost differential between the two types of shafts is minimal and the performance/life gain will pay for itself in the long run.

Another factor seldom considered is the vibrations which will be caused by the forces required for acceleration & deceleration of the mass of your driveline. A driveline which is too heavy and/or having radius which is too large along with running through a steep angle can accentuate a problem here.

Also, you need to know your u-joint life expectancy. Basically a u-joint is rated for specific, continuous operating load @ R.P.M. for hrs. with a 3 degree joint angle, and assuming proper periodic maintenance. If you double the angle you halve the life, halve the load you double the life, and vice versa. Because your driveline seldom sees a constant load, u-joint life becomes a difficult number to crunch. While hrs may not seem like much it's roughly equal to driving 8 hours a day, 5 days a week for 2 & 1/2 years. So 20% of life expectancy may not be such a bad number after all.

Most drive shafts will, depending on components used, incur a binding interference at about 25-30 degrees. You DO NOT, I repeat DO NOT want to run a drive shaft at any where near this angle. You need to allow for axle droop, frame flexing and differential roll. All of which can momentarily alter the operating angle of the u-joint to the point that it will cause what I refer to as an IMMEDIATE & CATASTROPHIC FAILURE. Ultimately you need to be certain that your driveline will rotate freely under full axle droop.

In leaf spring vehicles, it is also very important that you consider the upward pinion movement, caused by spring wrap, on the differential under high torque situations. You can usually get a pretty good idea of how much the differential will roll up, know as axle wrap, by watching this short video. 

Many people mistakenly believe that a double cardan (cv) type drive shaft will allow for greater operating angles than a conventional 2 joint or single cardan drive shaft. This is not true. Some types of CVs will actually incur a binding interference at less of an angle than a standard two joint drive line, depending on the individual components used. Additionally, the CV itself is longer than more conventional components and will create a greater operating angle on the driveline, due to a shorter run in the rise/run equation. This is especially true on very short shafts.

The real benefit to a CV (double cardan) drive shaft is smoother operation at higher operating angles and longer life. The CV assembly works by intersecting the joint angles at the center pivot point and delivering a smooth rotational power flow or surface velocity through the drive line. What about the 3rd joint in the double cardan shaft? With this type of driveline it is important to rotate the differential upward so that you have minimal joint operating angle at the differential end of the driveshaft. Any substantial joint angle would cause the pinion to try to speed up & slow down two times per revolution. Causing what is known as a torsional vibration. Torsional vibrations will also be created in a 2 joint driveline that has unequal angles at each of the u-joints or too much angle for each of the u-joints to fully cancel each other out. Rotating the differential upward will lessen the total operating angle at each end of the driveshaft. Now at the transfer case end of the driveshaft you have two joints equally dividing the total angle . This will double the life of the joints at this end, additionally you will be back up to full rated life for the joint at the differential end. I also believe a CV is stronger than a conventional driveline when turning through the same angle. This would be the result of transmitting the torque in a plane more perpendicular to centerline of the driveshaft.

One word of caution though, rotating the differential changes the location of the differential fill plug. Make sure the pinion tail bearing still receives adequate oil.  An over-fill may be required, overfilling the differential may cause a problem with foaming of the differential fluid. Adding about a cup of a Dextron type II automatic transmission fluid to your gear oil will lower the surface tension of the oil and should help control the foaming. Additionally while this rotation of the differential is easily done with the rear, front ends create a different problem. Because, unless you are willing to cut the differential housing away from the tubes and reweld, anything you do to correct for driveline angles up front will adversely effect the steering geometry of your vehicle. Most people do just what is done by vehicle manufacturers every day. That is, make some kind of a compromise, get things as right as possible for the high speed rear shaft and live with less than ideal performance from the generally lower speed less used front shaft.

If you understand and apply the concepts that I've attempted to convey here and do your homework, you should be able to figure out the right type of driveshaft for your application and how to properly adjust your angles. Understand that installing a lift or lowering your suspension does more that just make your Jeep or truck sit higher or lower, it changes the angles on your driveline. Understanding these changes will help you to make the right adjustments and/or to get the right driveshaft the first time around. After all, it really is a lot less expensive to do the job right the first time.

For more Parts of Cardan Shaftinformation, please contact us. We will provide professional answers.