EXHIBIT 99.6


     TRIPARTY  CONTINGENT  ASSIGNMENT  AGREEMENT  dated as of June 26, 2001 (the
"Agreement"),  among Capital Auto Receivables  Asset Trust 2001-2 (the "Trust"),
General Motors Acceptance Corporation ("GMAC") and Citibank, N.A. ("Citibank").

     WHEREAS,  the  Trust  and  Citibank  have  entered  into the  Primary  Swap
Agreement;

     WHEREAS, GMAC and Citibank have entered into the Secondary Swap Agreement;

     NOW, THEREFORE, the parties hereto hereby agree as follows:

                                    ARTICLE I

                                   Definitions

     SECTION 1.01 The following terms shall have the meanings set forth below:

     "Additional  Contingent  Counterparty"  means a Person  with the  Requisite
Rating  entering  into an  agreement  substantially  similar  to this  Agreement
pursuant to Section 2.02.

     "Assignment  Date" means the date upon which GMAC receives  notice from the
Trust of the occurrence of a Designated Event, or if such date is not a Business
Day, the next succeeding Business Day.

     "Delinquent  Payments"  means any payments owed to the Trust as a result of
liabilities,  obligations  and duties of Citibank  pursuant to the Primary  Swap
Agreement  accruing  prior to the  Assignment  Date  that  have not been made by
Citibank.

     A  "Designated  Event"  shall  occur (a) if one or more  Events of  Default
occurs under the Primary Swap Agreement  with Citibank as the  Defaulting  Party
and the Trust notifies  Citibank that it is declaring a Designated Event to have
occurred,  (b) upon the occurrence of any applicable Termination Event under the
Primary Swap Agreement in which Citibank is an Affected Party, if no transfer is
effected  under Part 1(f)(iv) of the Schedule to the Primary Swap  Agreement (or
in the case of a credit  downgrade  which results in GMAC having a higher credit
rating than Citibank,  no appropriate  arrangements pursuant to the Primary Swap
Confirmation's credit downgrade provisions are made within 30 days) with respect
to such event and an  assignment  pursuant to Section  2.01 would  result in the
non-occurrence  of such event as it  pertains  to  Citibank  or (c) if the Trust
receives a notice from  Citibank  pursuant  to the  provisions  of Section  2.03
herein.

     "Fallback Swap Agreement"  means the ISDA Master  Agreement  (including the
Schedule) and the Fallback Swap Confirmations.




     "Fallback Swap  Confirmations"  means (i) the Confirmation of Interest Rate
Swap Transaction re Class A-1 Notes, (ii) the Confirmation of Interest Rate Swap
Transaction  re Class A-2 Notes,  (iii) the  Confirmation  of Interest Rate Swap
Transaction  re  Certificates  and (iv) the  Confirmation  of Interest Rate Swap
Transaction re VPRNs, each of which is between GMAC and the Trust and which have
been entered into pursuant to the ISDA Master Agreement  (including the Schedule
thereto) dated as of June14, 2001 between GMAC and the Trust.

     "Fallback Swap Transaction" means the transaction  described in each of the
Fallback Swap Confirmations.

     "GMAC" means General Motors Acceptance Corporation.

     "Joint   Probability"   has  the  meaning   given  in  each   Primary  Swap
Confirmation.

     "Moody's" means Moody's Investors Service.

     "Operative  Swap  Agreement"  means (i) prior to the  Assignment  Date, the
Primary Swap Agreement and (ii) on and after the  Assignment  Date, the Fallback
Swap Agreement.

     "Operative Swap  Transactions"  means (i) prior to the Assignment Date, the
Primary  Swap  Transactions  and (ii) on and  after  the  Assignment  Date,  the
Fallback Swap Transactions.

     "Primary Swap  Agreement"  means the ISDA Master  Agreement  (including the
Schedule)  dated as of June 14, 2001  between  Citibank  and the Trust,  and the
Primary Swap Confirmations.

     "Primary Swap  Confirmations"  means (i) the  Confirmation of Interest Rate
Swap Transaction re Class A-1 Notes, (ii) the Confirmation of Interest Rate Swap
Transaction  re Class A-2 Notes,  (iii) the  Confirmation  of Interest Rate Swap
Transaction  re  Certificates  and (iv) the  Confirmation  of Interest Rate Swap
Transaction re VPRNs,  each of which is between Citibank and the Trust and which
have been  entered into  pursuant to the ISDA Master  Agreement  (including  the
Schedule thereto) dated as of June 14, 2001 between Citibank and the Trust.

     "Primary Swap Transaction"  means the transaction  described in each of the
Primary Swap Confirmations.

     "Requisite  Rating" means a long-term,  unsecured and  unsubordinated  debt
rating from S&P or Moody's which,  when considered  together with the long-term,
unsecured  and  unsubordinated  debt  rating  of GMAC,  would  result in a Joint
Probability of at least AA- in the case of S&P, or Aa3 in the case of Moody's.

     "Secondary Swap Agreement" means the ISDA Master  Agreement  (including the
Schedule thereto), dated as of March 22, 1988, between Citibank and GMAC and the
Secondary Swap Confirmations.


                                      - 2 -


     "Secondary Swap Confirmations"  means (i) the Confirmation of Interest Rate
Swap Transaction re Class A-1 Notes, (ii) the Confirmation of Interest Rate Swap
Transaction  re Class A-2 Notes,  (iii) the  Confirmation  of Interest Rate Swap
Transaction re  Certificates,  and (iv) the  Confirmation  of Interest Rate Swap
Transaction re VPRNs,  each of which is between GMAC and Citibank and which have
been entered into pursuant to the ISDA Master Agreement  (including the Schedule
thereto) dated as of ___________, ____ between GMAC and Citibank.

     "Secondary Swap Transaction" means the transaction described in each of the
Secondary Swap Confirmations.

     "Servicer"  means GMAC or its  successor as servicer  pursuant to the Trust
Sale and Servicing Agreement.

     "S&P"  means  Standard  and Poor's  Ratings  Services,  a  Division  of the
McGraw-Hill Companies and any successor.

     SECTION 1.02 Definitions.  Capitalized terms used in this Agreement and not
otherwise defined herein shall have the meanings specified for such terms (i) in
the Primary Swap Agreement or the Secondary Swap  Agreement,  as dictated by its
context  or (ii) if not  defined  therein,  in  Appendix A to the Trust Sale and
Servicing Agreement, dated as of June 26, 2001 between the Trust, the Seller and
the  Servicer  (the  "Trust  Sale  and  Servicing  Agreement").   The  rules  of
construction  specified  in Part  II of such  Appendix  A  shall  apply  to this
Agreement.

                                   ARTICLE II

                        Assignment Upon Designated Event

     SECTION 2.01  Assignment.  In the event that a Designated  Event shall have
occurred and is then  continuing  and the Trust has notified  GMAC in writing of
such   occurrence  and  continuance   and  has  provided   evidence   reasonably
satisfactory  to  GMAC  that  a  Designated  Event  has  occurred  and  is  then
continuing,  each of the following shall  automatically  occur on the Assignment
Date:

          (a) GMAC shall accede to rights and obligations equivalent to those of
     Citibank under each of the Primary Swap Transactions in accordance with the
     terms of the Fallback Swap Agreement (including rights, title and interests
     and  liabilities,  obligations  and duties accruing prior to the Assignment
     Date).  In  connection  with the  foregoing,  in the event  that  there are
     Delinquent Payments under any Primary Swap Transaction, GMAC shall promptly
     (and in any event no later than the next Business Day) make the full amount
     of such Delinquent  Payments to the Trust (but only to the extent that GMAC
     has not made a corresponding payment under the Fallback Swap Agreement). In
     the  event  that  Citibank  has been paid an  amount  corresponding  to the
     Delinquent Payments under the Secondary Swap Agreement,  Citibank agrees to
     reimburse  GMAC in an amount equal to the full amount of any such payments.
     In the event that Citibank has made payments to the Trust as a result


                                      - 3 -




     of liabilities,  obligations  and duties of Citibank  accruing prior to the
     Assignment Date in circumstances  where GMAC has not made the corresponding
     payments to Citibank  under the Secondary  Swap  Agreement,  GMAC agrees to
     reimburse  Citibank  in an  amount  equal  to the full  amount  of any such
     payments.  Except  as  expressly  provided  in the third  sentence  of this
     paragraph (a), on and at all times following the Assignment Date,  Citibank
     shall  have no  liabilities,  obligations  and  duties,  including  payment
     obligations  of any  kind,  under the  Primary  Swap  Agreement.  As of the
     Assignment  Date,  the Primary Swap  Transactions  shall be governed by the
     terms of the Fallback Swap Agreement,  and the Primary Swap Agreement shall
     no longer  govern the Primary  Swap  Transactions  (except  with respect to
     rights, liabilities, obligations and duties accrued prior to the Assignment
     Date).

          (b) The Secondary Swap  Transactions  shall be terminated on and as of
     the Assignment Date without further liability or obligation of either party
     thereto,  without prejudice to those rights,  liabilities,  obligations and
     duties accruing prior to the Assignment Date.

          (c) Upon (i) the effectiveness of the Fallback Swap Agreement and (ii)
     the  payment  by GMAC to the Trust in a timely  fashion  of all  Delinquent
     Payments,  if any, (x) the Event of Default or Termination  Event under the
     Primary Swap Agreement constituting such Designated Event, if any, shall be
     deemed  to be  cured  on and as of the  Assignment  Date,  and (y) no Early
     Termination  Date  (as  defined  in  the  Primary  Swap  Agreement)  may be
     designated as a result of such Designated Event.

     There  shall be no  breakage  fees or other  termination  costs or expenses
payable by the Trust to Citibank or by  Citibank to GMAC in  connection  with an
assignment of the Primary Swap Agreement to GMAC in accordance with this Section
2.01 and the  termination  of a Secondary  Swap  Transaction  as a result of the
occurrence and continuance of a Designated Event.

     SECTION 2.02 Additional Contingent Counterparty. If GMAC has acceded to the
rights  and  obligations  of  Citibank  under  the  Primary  Swap  Agreement  in
accordance with the provisions of this Article II, GMAC shall have the option to
find a Person  with the  Requisite  Rating  that will  either  (i) enter into an
assignment agreement that is substantially similar to this Agreement pursuant to
which such Person will become the  Additional  Contingent  Counterparty  or (ii)
enter  into  a swap  transaction  substantially  similar  to  the  Primary  Swap
Transactions and a contingent assignment agreement that is substantially similar
to this  Agreement  under  which  such  Person  would  accede to the  rights and
obligations  of GMAC under the Primary Swap  Agreement  and GMAC will become the
Additional Contingent Counterparty.  Citibank shall reimburse GMAC for any costs
associated  with  finding  a  party  to  serve  as  the  Additional   Contingent
Counterparty.  Any  delay  or  inability  in  finding  a party  to  serve as the
Additional  Contingent  Counterparty  will not  result  in the  occurrence  of a
Termination  Event,  an Event of Default or otherwise lead to the designation of
an Early Termination Date under the Operative Swap Agreement.

     SECTION 2.03 Notice. Citibank agrees that, to the extent that it has actual
knowledge  that it will be unable to make a payment or  delivery  on a scheduled
payment date under the Primary


                                      - 4 -


Swap Agreement,  it shall provide notice to the Trust of such inability at least
two Business Days prior to such scheduled  payment date. This Section 2.03 shall
not be construed to obligate  Citibank to undertake  any  affirmative  action or
inquiry  to  ascertain  whether  it will be able to make  any  such  payment  or
delivery.  Any  failure  by  Citibank  to  provide  notice  to the Trust of such
inability shall be without  prejudice to Citibank's  rights under this Agreement
and the Primary Swap Agreement.

                                   ARTICLE III

                                  Miscellaneous

     SECTION 3.01  Miscellaneous.  (a) Entire  Agreement.  This  Agreement,  the
Primary Swap Agreement and the Secondary  Swap  Agreement  constitute the entire
agreement and  understanding  of the parties with respect to the subject  matter
thereof and  supersede all oral  communications  and prior  writings  (except as
otherwise provided therein) with respect thereto.

     (b)  Counterparts.   This  Agreement  may  be  executed  and  delivered  in
counterparts  (including by facsimile transmission) each of which will be deemed
an original.

     (c) Headings.  The headings used in this  agreement are for  convenience of
reference  only and are not to affect  the  construction  of or to be taken into
consideration in interpreting this Agreement.

     (d)  GOVERNING  LAW.  THIS  AGREEMENT  WILL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE  WITH THE LAWS OF THE STATE OF NEW YORK (WITHOUT  REFERENCE TO CHOICE
OF LAW DOCTRINE).

     (e)  Notices.  All  demands,  specifications  and notices to a party hereto
under this Agreement will be made pursuant to the provisions of the Primary Swap
Agreement or the Secondary Swap Agreement, as applicable.

     (f) No Waiver. Notwithstanding any other provision in this Agreement to the
contrary, no full or partial failure to exercise and no delay in exercising,  on
the part of any party hereto, any right,  remedy,  power or privilege under this
Agreement,  regardless  of the  frequency or constancy of such failure or delay,
shall operate in any way as a waiver thereof by such party.

     (g) Inconsistencies.  Except as expressly provided herein, the Primary Swap
Agreement shall not be deemed to be amended hereby in any respect.  In the event
of any inconsistencies between the provisions of this Agreement and those of the
Primary Swap Agreement or the Secondary Swap  Agreement,  the provisions  hereof
shall prevail.

     (h)  Amendments.  This Agreement may not be amended except by the execution
of a written instrument by all parties hereto.


                                      - 5 -



     (i) Limitation of Liability.  It is expressly  understood and agreed by the
parties  hereto that (a) this  Agreement  is executed  and  delivered by Bankers
Trust (Delaware),  not in its individual capacity but solely as Owner Trustee of
Capital  Auto  Receivables  Asset Trust 2001-2 in the exercise of the powers and
authority  conferred  and  vested  in  it,  (b)  each  of  the  representations,
undertakings  and  agreements  herein  made on the part of the Trust is made and
intended not as personal representations, undertakings and agreements by Bankers
Trust  (Delaware)  but is made and intended for the purpose for binding only the
Trust, (c) nothing herein contained shall be construed as creating any liability
on Bankers Trust (Delaware) in its individual,  corporate  capacity,  to perform
any covenant either expressed or implied contained  herein,  all such liability,
if any, being expressly  waived by the parties hereto and by any Person claiming
by,  through or under the parties  hereto and (d) under no  circumstances  shall
Bankers  Trust   (Delaware)  be  personally   liable  for  the  payment  of  any
indebtedness  or expenses of the Trust or be liable for the breach or failure of
any obligation,  representation,  warranty or covenant made or undertaken by the
Trust under this Agreement or any other related documents.


                                      - 6 -




     IN WITNESS WHEREOF,  the parties have executed this agreement by their duly
authorized officers as of the date hereof.

                              CAPITAL AUTO RECEIVABLES ASSET TRUST
                              2001-2

                              By BANKERS TRUST (DELAWARE) not in
                              its individual capacity, but solely as trustee

                              By         CHARLES C. GREITER
                                 -------------------------------------------
                                 Name:   Charles C. Greiter
                                 Title:  Attorney-in-Fact


                              GENERAL MOTORS ACCEPTANCE
                              CORPORATION

                              By ------------------------------------------
                                 Name:
                                 Title:


                              CITIBANK, N.A.
                              By ------------------------------------------
                                 Name:
                                 Title:






                                      - 7 -