ASSIGNMENT AND ASSUMPTION AGREEMENT

                                                                  EXECUTION COPY

                       ASSIGNMENT AND ASSUMPTION AGREEMENT


        ASSIGNMENT  AND  ASSUMPTION  AGREEMENT,  dated as of  December  6, 2005,
between  Residential  Funding  Corporation,  a Delaware  corporation ("RFC") and
Residential  Asset  Mortgage  Products,   Inc.,  a  Delaware   corporation  (the
"Company").

                                    Recitals

A.  RFC  has  entered  into  seller  contracts  ("Seller  Contracts")  with  the
seller/servicers  pursuant to which such seller/servicers sell mortgage loans to
RFC.

B.  The  Company  wishes  to  purchase  from  RFC  certain  Mortgage  Loans  (as
hereinafter  defined)  originated  pursuant to the Seller Contracts with respect
thereto.

C. The Company,  RFC, as master  servicer,  and JPMorgan  Chase Bank,  N.A.,  as
trustee (the  "Trustee"),  are entering into a Pooling and  Servicing  Agreement
dated as of November 1, 2005 (the "Pooling and Servicing  Agreement"),  pursuant
to which the Trust will issue Mortgage Asset-Backed  Pass-Through  Certificates,
Series 2005-RZ4 (the "Certificates")  consisting of seventeen classes designated
as Class A-1,  Class A-2, Class A-3, Class M-1, Class M-2, Class M-3, Class M-4,
Class M-5,  Class M-6, Class M-7, Class M-8, Class B, Class SB, Class R-I, Class
R-II and Class R-III,  representing  beneficial  ownership  interests in a trust
fund  consisting  primarily  of a pool that will be  divided  into the fixed and
adjustable rate one- to four-family  mortgage loans identified on Exhibit F-1 to
the Pooling and Servicing Agreement (the "Mortgage Loans").

D. In  connection  with the  purchase of the  Mortgage  Loans,  the Company will
assign to RFC the  Class  R-I,  Class  R-II and Class  R-III  Certificates  (the
"Retained Certificates").

E. In connection with the purchase of the Mortgage Loans and the issuance of the
Certificates,  RFC wishes to make certain  representations and warranties to the
Company and to assign  certain of its rights  under the Seller  Contracts to the
Company, and the Company wishes to assume certain of RFC's obligations under the
Seller Contracts.

F. The Company and RFC intend that the  conveyance  by RFC to the Company of all
its right,  title and  interest in and to the  Mortgage  Loans  pursuant to this
Agreement shall constitute a purchase and sale and not a loan.

        NOW THEREFORE,  in consideration of the recitals and the mutual promises
herein and other good and valuable consideration, the parties agree as follows:

1. All  capitalized  terms used but not defined  herein  shall have the meanings
assigned thereto in the Pooling and Servicing Agreement.

2.  Concurrently  with the execution and delivery hereof,  RFC hereby assigns to
the Company without recourse all of its right,  title and interest in and to the
Mortgage Loans, including all interest and principal received on or with respect
to the Mortgage  Loans after the Cut-off Date (other than  payments of principal
and  interest due on the Mortgage  Loans in the month of the Cut-off  Date).  In
consideration  of such  assignment,  RFC  will  receive  from  the  Company,  in
immediately  available  funds,  an amount  equal to  $429,250,493.61,  including
accrued  interest,  and the  Retained  Certificates.  In  connection  with  such
assignment and at the Company's  direction,  RFC has in respect of each Mortgage
Loan endorsed the related Mortgage Note (other than any Destroyed Mortgage Note)
to the  order  of the  Trustee  and  delivered  an  assignment  of  mortgage  in
recordable  form to the Trustee or its agent. A Destroyed  Mortgage Note means a
Mortgage Note the original of which was permanently lost or destroyed.

               The  Company  and RFC intend  that the  conveyance  by RFC to the
Company  of all its  right,  title and  interest  in and to the  Mortgage  Loans
pursuant to this Section 2 shall be, and be construed as, a sale of the Mortgage
Loans by RFC to the Company.  It is, further,  not intended that such conveyance
be deemed to be a pledge of the Mortgage Loans by RFC to the Company to secure a
debt or other obligation of RFC. Nonetheless,  (a) this Agreement is intended to
be and  hereby  is deemed to be a  security  agreement  within  the  meaning  of
Articles  8 and 9 of the  Minnesota  Uniform  Commercial  Code  and the  Uniform
Commercial  Code  of any  other  applicable  jurisdiction;  (b)  the  conveyance
provided for in this Section shall be deemed to be a grant by RFC to the Company
of a security  interest  in all of RFC's  right  (including  the power to convey
title thereto), title and interest,  whether now owned or hereafter acquired, in
and to (A) the Mortgage Loans, including the Mortgage Notes, the Mortgages,  any
related  insurance  policies  and all other  documents  in the related  Mortgage
Files, (B) all amounts payable pursuant to the Mortgage Loans in accordance with
the terms thereof and (C) any and all general intangibles consisting of, arising
from or relating to any of the  foregoing,  and all proceeds of the  conversion,
voluntary or involuntary, of the foregoing into cash, instruments, securities or
other property,  including,  without  limitation,  all amounts from time to time
held or invested in the Certificate Account or the Custodial Account, whether in
the form of cash, instruments,  securities or other property; (c) the possession
by the  Trustee,  the  Custodian  or any other  agent of the Trustee of Mortgage
Notes or such other items of property as constitute instruments,  money, payment
intangibles,  negotiable documents,  goods, deposit accounts, letters of credit,
advices of credit, investment property, certificated securities or chattel paper
shall be deemed to be  "possession  by the secured  party",  or  possession by a
purchaser  or a  person  designated  by such  secured  party,  for  purposes  of
perfecting the security interest  pursuant to the Minnesota  Uniform  Commercial
Code  and the  Uniform  Commercial  Code of any  other  applicable  jurisdiction
(including,  without limitation,  Sections 8-106, 9-313 and 9-106 thereof);  and
(d)  notifications  to  persons  holding  such  property,  and  acknowledgments,
receipts or  confirmations  from persons holding such property,  shall be deemed
notifications to, or acknowledgments,  receipts or confirmations from, financial
intermediaries, bailees or agents (as applicable) of the Trustee for the purpose
of perfecting  such security  interest under  applicable  law. RFC shall, to the
extent  consistent with this Agreement,  take such reasonable  actions as may be
necessary to ensure  that,  if this  Agreement  were deemed to create a security
interest in the Mortgage  Loans and the other  property  described  above,  such
security  interest would be deemed to be a perfected  security interest of first
priority under applicable law and will be maintained as such throughout the term
of this Agreement.  Without limiting the generality of the foregoing,  RFC shall
prepare  and  deliver to the  Company  not less than 15 days prior to any filing
date, and the Company shall file, or shall cause to be filed,  at the expense of
RFC, all filings necessary to maintain the effectiveness of any original filings
necessary under the Uniform  Commercial Code as in effect in any jurisdiction to
perfect  the  Company's  security  interest  in or  lien on the  Mortgage  Loans
including  without  limitation (x) continuation  statements,  and (y) such other
statements as may be occasioned by (1) any change of name of RFC or the Company,
(2) any change of location of the place of  business,  state of formation or the
chief executive office of RFC, or (3) any transfer of any interest of RFC in any
Mortgage Loan.

3.  Concurrently  with the execution  and delivery  hereof,  the Company  hereby
assigns to RFC without  recourse all of its right,  title and interest in and to
the Retained  Certificates  as part of the  consideration  payable to RFC by the
Company pursuant to this Agreement.

4. RFC  represents  and  warrants to the Company  that on the date of  execution
hereof (or, if otherwise specified below, as of the date so specified):

               (a) The  information  set forth in the Mortgage Loan Schedule for
        such Mortgage  Loans is true and correct in all material  respects as of
        the date or dates respecting which such information is furnished;

               (b) Each Mortgage Loan  constitutes a "qualified  mortgage" under
        Section  860G(a)(3)(A)  of the  Code  and  Treasury  Regulation  Section
        1.860G-2(a)(1), (2), (4), (5), (6), (7) and (9), without reliance on the
        provisions of Treasury  Regulation  Section  1.860G-2(a)(3)  or Treasury
        Regulation  Section  1.860G-2(f)(2)  or any other  provision  that would
        allow  a  Mortgage  Loan  to  be  treated  as  a  "qualified   mortgage"
        notwithstanding   its  failure  to  meet  the  requirements  of  Section
        860G(a)(3)(A)   of   the   Code   and   Treasury    Regulation   Section
        1.860G-2(a)(1), (2), (4), (5), (6), (7) and (9);

               (c) Immediately  prior to the conveyance of the Mortgage Loans to
        the  Company,  RFC had good title to,  and was the sole  owner of,  each
        Mortgage  Loan  free  and  clear of any  pledge,  lien,  encumbrance  or
        security   interest   (other  than  rights  to  servicing   and  related
        compensation)  and such conveyance  validly  transfers  ownership of the
        Mortgage  Loans to the  Company  free and  clear  of any  pledge,  lien,
        encumbrance or security interest;

               (d) Each  Mortgage Note  constitutes  a legal,  valid and binding
        obligation of the  Mortgagor  enforceable  in accordance  with its terms
        except as  limited  by  bankruptcy,  insolvency  or other  similar  laws
        affecting generally the enforcement of creditors' rights;

               (e)  There  is  no  default,   breach,   violation  or  event  of
        acceleration  existing  under the terms of any Mortgage Note or Mortgage
        and no event  which,  with  notice and  expiration  of any grace or cure
        period,  would  constitute  a  default,  breach,  violation  or event of
        acceleration  under the terms of any Mortgage  Note or Mortgage,  and no
        such default, breach, violation or event of acceleration has been waived
        by RFC or by any other entity involved in servicing a Mortgage Loan;

               (f) As of the Cut-off  Date,  none of the  Mortgage  Loans are 30
        days or more delinquent in payment of principal and interest;

               (g) None of the Mortgage Loans are Buydown Mortgage Loans;

               (h) There is no  delinquent  tax or  assessment  lien against any
        related Mortgaged Property;

               (i) No  Mortgagor  has any  valid  right of  offset,  defense  or
        counterclaim as to the related Mortgage Note or Mortgage,  except as may
        be provided under the Relief Act;

               (j) No Mortgage  Loan  provides for payments  that are subject to
        reduction by withholding taxes levied by any foreign (non-United States)
        sovereign government;

               (k) (1) The  proceeds  of each  Mortgage  Loan  have  been  fully
        disbursed and (2) there is no requirement for future advances thereunder
        and any and all requirements as to completion of any on-site or off-site
        improvements  and as to  disbursements  of  any  escrow  funds  therefor
        (including  any  escrow  funds  held to make  Monthly  Payments  pending
        completion of such  improvements)  have been complied  with.  All costs,
        fees and expenses incurred in making,  closing or recording the Mortgage
        Loans were paid;

               (l) There are no  mechanics'  liens or claims for work,  labor or
        material  affecting  any Mortgaged  Property  which are or may be a lien
        prior to, or equal with, the lien of the related  Mortgage,  except such
        liens that are  insured  or  indemnified  against  by a title  insurance
        policy;

               (m)  With  respect  to each  Mortgage  Loan,  a  policy  of title
        insurance  was  effective as of the closing of each  Mortgage  Loan,  is
        valid and  binding,  and  remains in full force and  effect,  unless the
        Mortgaged  Properties are located in the State of Iowa and an attorney's
        certificate has been provided;

               (n) Each Mortgaged  Property is free of material damage and is in
        good repair and no notice of  condemnation  has been given with  respect
        thereto;

               (o) Each Mortgage contains  customary and enforceable  provisions
        which render the rights and  remedies of the holder  adequate to realize
        the benefits of the security against the Mortgaged  Property,  including
        (i) in the case of a  Mortgage  that is a deed of  trust,  by  trustee's
        sale, or (ii) by judicial  foreclosure  or, if applicable,  non-judicial
        foreclosure,  and to the best of RFC's knowledge,  there is no homestead
        or other exemption  available to the Mortgagor that would interfere with
        such right to sell at a trustee's sale or right to foreclosure,  subject
        in  each  case  to  applicable  federal  and  state  laws  and  judicial
        precedents with respect to bankruptcy and right of redemption;

               (p) With