Exhibit 99.6

     TRIPARTY CONTINGENT  ASSIGNMENT AGREEMENT dated as of January 17, 2001 (the
"Agreement"),  among Capital Auto Receivables  Asset Trust 2001-1 (the "Trust"),
General  Motors  Acceptance  Corporation  ("GMAC")  and  Merrill  Lynch  Capital
Services, Inc. ("MLCS").

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

         WHEREAS, GMAC and MLCS 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 MLCS  pursuant  to the  Primary  Swap
Agreement accruing prior to the Assignment Date that have not been made by MLCS.

     A  "Designated  Event"  shall  occur (a) if one or more  Events of  Default
occurs under the Primary Swap Agreement  with MLCS as the  Defaulting  Party and
the  Trust  notifies  MLCS  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 MLCS 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,  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 MLCS or (c) if the
Trust  receives a notice from MLCS  pursuant to the  provisions  of Section 2.03
herein.

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




     "Fallback Swap  Confirmations"  means (i) the Confirmation of Interest Rate
Swap Transaction re Class A-4 Notes, (ii) the Confirmation of Interest Rate Swap
Transaction  re Class A-5  Notes  and the  Confirmation  of  Interest  Rate Swap
Transaction  re VPRNs,  each of which is between  GMAC and the Trust and each of
which have been entered into  pursuant to the ISDA Master  Agreement  (including
the Schedule thereto) dated as of January 9, 2001 between GMAC and the Trust.

     "Fallback  Swap  Transaction"  means  the  transaction  described  in a
Primary Swap Confirmation.

     "GMAC" means General Motors Acceptance Corporation.

     "Joint  Probability"  has  the  meaning  given  in  each  Primary  Swap
Confirmation and each Fallback 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 January 9, 2001 between MLCS and the Trust,  and the three
Primary Swap Confirmations.

     "Primary Swap  Confirmations"  means (i) the  Confirmation  of Interest
Rate Swap Transaction re Class A-4 Notes, (ii) the Confirmation of Interest Rate
Swap  Transaction re Class A-5 Notes and the  Confirmation of Interest Rate Swap
Transaction  re VPRNs,  each of which is between  MLCS and the Trust and each of
which have been entered into  pursuant to the ISDA Master  Agreement  (including
the Schedule thereto) dated as of January 9, 2001 between MLCS and the Trust.

     "Primary Swap Transaction" means the transaction described in a Primary
Swap Confirmation.

     "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 November 15, 1996, between MLCS and GMAC and
the Secondary Swap Confirmations.

     "Secondary Swap Confirmations"  means the Confirmation of Interest Rate
Swap Transaction re Class A-4 Notes, (ii) the Confirmation of Interest Rate Swap
Transaction  re Class A-5  Notes  and the  Confirmation  of  Interest  Rate Swap
Transaction  re VPRNs,  each of which is between GMAC and MLCS and each of which
have been  entered into  pursuant to the ISDA Master  Agreement  (including  the
Schedule thereto) dated as of November 15, 1996 between GMAC and MLCS.

     "Secondary  Swap  Transaction"  means the  transaction  described  in a
Secondary Swap Confirmation.

     "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 January 17, 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
     MLCS 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 MLCS has been paid an amount corresponding to the Delinquent
     Payments under the Secondary Swap Agreement,  MLCS agrees to reimburse GMAC
     in an amount  equal to the full amount of any such  payments.  In the event
     that  MLCS has made  payments  to the  Trust  as a result  of  liabilities,
     obligations  and duties of MLCS accruing  prior to the  Assignment  Date in
     circumstances  where GMAC has not made the  corresponding  payments to MLCS
     under the Secondary  Swap  Agreement,  GMAC agrees to reimburse  MLCS 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, MLCS 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).

          For the  avoidance  of doubt,  on and with effect from the  Assignment
     Date,  the  Guarantee  of Merrill  Lynch & Co.,  Inc. in favor of the Trust
     under the Primary Swap  Agreement  shall be  terminated  and cease to be in
     effect (except in respect of liabilities,  obligations and duties which may
     have accrued under such guarantee 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 MLCS or by MLCS 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 the 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 MLCS 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.  MLCS 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. MLCS 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 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  MLCS to
undertake any affirmative action or inquiry to ascertain whether it will be able
to make any such payment or delivery.  Any failure by MLCS to provide  notice to
the Trust of such  inability  shall be without  prejudice to MLCS'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.

     (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 individually or personally but solely as Owner Trustee of
Capital  Auto  Receivables  Asset Trust 2001-1 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), individually or personally, 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.



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

                          CAPITAL AUTO RECEIVABLES ASSET TRUST
                          2001-1

                          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:

                          MERRILL LYNCH CAPITAL SERVICES, INC.

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