UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 10-K

[X]      Annual  report  pursuant  to  Section  13 or  15(d)  of the Securities
         Exchange Act of 1934 for the fiscal year ended December 31, 2004

[ ]      Transition report pursuant to Section 13 or 15(d) of the
         Securities Exchange Act of 1934 for the transition period from   to


                  Commission File Number  333-110437-12

                    RESIDENTIAL ASSET MORTGAGE PRODUCTS, INC
             (Exact name of registrant as specified in its charter)


       Delaware                                       41-1955181
 (State or other jurisdiction of               (IRS Employer Identification No.)
     incorporation)

8400 Normandale Lake Boulevard, Suite 250
Minneapolis, MN                                           55437
(Address of principal executive offices)                (Zip Code)

Registrant's telephone number, including area code :  (952) 857-7000

               GMACM Mortgage Trust Certificates, Series 2004-AR1
            (Title of each class of securities covered by this Form)

Securities registered pursuant to Section 12(b) of the Act:  None
Securities registered pursuant to Section 12(g) of the Act:  None

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Exchange Act Rule 12b-2). Yes [ ]  No [X]

                   Documents incorporated by reference: None


<PAGE>


PART I

Item 1.  Business.

         Not Applicable.

Item 2.  Properties.

         Not Applicable.

Item 3.  Legal Proceedings.

     The Registrant is not aware of any material legal  proceeding  with respect
to the Company, the Servicer or the Trustee, as related to the Trust.

Item 4.  Submission of Matters to a Vote of Security Holders.

     No matter was  submitted  to a vote or  consent  of Holders of the  Offered
Certificates during the fiscal year covered by this report.

PART II

Item 5. Market for Registrant's Common Equity,  Related Stockholder Matters
        and Issuer Purchases of Equity Securities.

     The Trust does not issue stock. There is currently no established secondary
market for the  Certificates.  As of December 31, 2004, the number of holders of
each Class of Offered Certificates was 10.

Item 6.  Selected Financial Data.

         Not Applicable.

Item 7.  Management's Discussion and Analysis of Financial condition and
         Results of Operation.

         Not Applicable.

Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

         Not Applicable.

Item 8.  Financial Statements and Supplementary Data

         Not Applicable.

Item 9.  Changes in and Disagreements with Accountants on Accounting and
         Financial Disclosure

     There was no change of accountants or disagreement  with accountants on any
matter of accounting principles or practices or financial disclosure.

Item 9A. Controls and Procedures.

         Not Applicable.

Item 9B. Other Information.

         Not Applicable.

                                      -2-

<PAGE>

PART III

Item 10. Directors and Executive Officers of the Registrant.

         Not Applicable.

Item 11. Executive Compensation.

         Not Applicable.

Item 12. Security Ownership of Certain Beneficial Owners and Management.

         Not Applicable.

Item 13. Certain Relationships and Related Transactions.

         No reportable transactions have occurred.

Item 14. Principal Accounting Fees and Services.

         Not Applicable.

PART IV

Item 15. Exhibits, Financial Statement Schedules.

(a) The following documents are filed as part of this report:

    (1) Financial Statements:

         Not Applicable.

    (2)  Financial Statement Schedules:

         Not Applicable.

    (3)  Exhibits:

     Rule 13a-14(a)/15d-14(a) Certification, filed as 31.1 hereto.

        Annual Independent Accountants' Servicing Report
        with Management Assertion, filed as Exhibit 99.1 hereto.

        Servicer's Annual Statement as to Compliance,
        filed as Exhibit 99.2, hereto.

(b) Exhibits to this report are listed in Item (15)(a)(3)above.

(c) Not Applicable.

                                      -3-

<PAGE>


GMACM Mortgage Trust Certificates, Series 2004-AR1
-----------------------------------------------------------------------

SIGNATURE

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  registrant  has duly  caused  this report to be signed on its
behalf by the undersigned thereunto duly authorized.


                               By:     GMAC MORTGAGE CORPORATION

                                       /s/ Patty Taylor
                                       --------------------------------------
                              Name:    Patty Taylor
                             Title:    Vice President

                              Date:    March 31, 2005




                                      -4-
<PAGE>

SUPPLEMENTAL  INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO SECTION
15(D) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED SECURITIES PURSUANT TO
SECTION 12 OF THE ACT.

The  registrant  has not sent an annual report or proxy material to its security
holders.  The registrant  will not be sending an annual report or proxy material
to its security holders subsequent to the filing of this form.

                                      -5-
<PAGE>


                                 EXHIBIT INDEX

Exhibit     Description

31.1    Rule 13a-14(a)/15d-14(a) Certification

99.1    Annual Independent Accountants' Servicing Report
        with Management Assertion

99.2    Annual Servicer's Statement as to Compliance


                                      -6-
<PAGE>

                                EXHIBIT 31.1
                Annual Rule 13a-14(a)/15d-14(a) Certification
                                -------------

          I, Patty Taylor, certify that:

     1. I have reviewed the annual report on Form 10-K for the fiscal year ended
December  31,  2004,  and all  reports on Form 8-K  containing  distribution  or
servicing  reports  filed in respect of periods  included in the year covered by
that annual report, of GMACM Mortgage Loan Trust 2004-AR1 (the "Trust"), created
pursuant to the Pooling and Servicing  Agreement  dated April 29, 2004 (the "P&S
Agreement")  among Residential  Asset Mortgage  Products,  Inc. (the "Company"),
GMAC  Mortgage  Corporation  (the  "Servicer")  and  JPMorgan  Chase  Bank  (the
"Trustee");

         2. Based on my knowledge,  the information in these reports, taken as a
whole, does not contain any untrue statement of a material fact or omit to state
a  material  fact  necessary  to make  the  statements  made,  in  light  of the
circumstances  under which such  statements  were made, not misleading as of the
last day of the period covered by that annual report;

         3. Based on my  knowledge,  the  servicing  information  required to be
provided to the Trustee by the Servicer  under the P&S  Agreement is included in
these reports;

         4. I am  responsible  for  reviewing  the  activities  performed by the
Servicer  under the P&S  Agreement  and based upon my  knowledge  and the review
required under the P&S Agreement,  and,  except as disclosed in the report,  the
Servicer has fulfilled its obligations under the P&S Agreement; and

         5. The reports  disclose all significant  deficiencies  relating to the
Servicer's compliance with the minimum servicing standards based upon the report
provided by an  independent  public  accountant  , after  conducting a review in
compliance with the Uniform Single Attestation  Program for Mortgage Bankers, or
similar procedure, as set forth in the P&S Agreement,  that is included in these
reports.

         In  giving  the  certifications  above,  I have  reasonably  relied on
information  provided to me by the  following  unaffiliated  parties: JPMorgan
Chase Bank, N.A.

                                      GMAC MORTGAGE CORPORATION

                                  By:   /s/ Anthony Renzi
                                        -----------------
                                Name:   Anthony Renzi
                               Title:   Executive Vice President
                                Date:   March 31, 2005

<PAGE>

                                  EXHIBIT 99.1
                Annual Independent Accountants' Servicing Report
                           with Management Assertion
                        -------------------------------


PRICEWATERHOUSECOOPERS


                                        PricewaterhouseCoopers LLP
                                        125 High Street
                                        Boston, MA  02110-1707
                                        Telephone (817) 530-5000
                                        Facsimile (617) 530-5001
                                        www.pwc.com



                       Report of Independent Auditors


To the Board of Directors and Shareholder
of GMAC Mortgage Corporation:


We have examined management's  assertion about GMAC Mortgage Corporation and its
subsidiaries'  (the "Company")  compliance with the minimum servicing  standards
("standards")  identified  in the  Mortgage  Bankers  Association  of  America's
Uniform Single  Attestation  Program for Mortgage Bankers ("USAP") as of and for
the year  ended  December  31,  2004  included  in the  accompanying  management
assertion  (see  Exhibit  I).   Management  is  responsible  for  the  Company's
compliance with those minimum  servicing  standards.  Our  responsibility  is to
express an opinion on management's assertion about the entity's compliance based
on our examination.

Our  examination  was  made in  accordance  with  standards  established  by the
American  Institute of Certified Public Accountants and,  accordingly,  included
examining,  on a test basis,  evidence about the Company's  compliance  with the
standards and performing such other procedures as we considered necessary in the
circumstances.  We believe that our examination  provides a reasonable basis for
our  opinion.  Our  examination  does not provide a legal  determination  on the
Company's compliance with the standards.

Our examination  identified  certain instances of non compliance with USAP as it
relates to Section I - Custodial  Bank Accounts.  Specifically,  there were bank
accounts  over the course of several  months  where the  Company was not in full
compliance with USAP  requirements as it related to the preparation of custodial
bank reconciliations within 45 calendar days of cutoff as well as the resolution
of  reconciling  items with 90  calendar  days of original  identification.  The
Company  remediated  the issues  related to the  preparation  of custodial  bank
accounts  reconciliations  within 45 calendar  days of December 31, 2004.  These
instances of non compliance as well as management's  remediation status are more
fully described in management's assertion, which is set forth in Exhibit I.

In our  opinion,  management's  assertion  that the  Company  complied  with the
aforementioned  standards except for the instances of non compliance  related to
Section I - Custodial Bank  Accounts,  as of and for the year ended December 31,
2004 is fairly stated, in all material respects.


By:  /s/PricewaterhouseCoopers, LLC
------------------------------------
PricewaterhouseCooper, LLC

March 18, 2005

<page>

GMAC Mortgage

                                                                Exhibit I


                  Management's Assertion Concerning Compliance
                     with USAP Minimum Servicing Standards

March 18, 2005


As of and for the year ended December 31, 2004,  GMAC Mortgage  Corporation  and
its subsidiaries (the "Company") have complied in all material respects with the
minimum servicing  standards (the "Standards") set forth in the Mortgage Bankers
Association of America's Uniform Single Attestation Program for Mortgage Bankers
("USAP")  except as follows:  Section I - Custodial Bank Accounts  requires that
reconciliations  be prepared on a monthly basis for all custodial  bank accounts
and related bank  clearing  accounts.  These  reconciliations  shall be prepared
within forty-five (45) calendar days after the cutoff date and reconciling items
resolved within ninety (90) calendar days of their original identification.

Subsequent to the Company's  servicing  platform  conversion  that took place in
January of 2004,  and as a result of temporary  reporting  challenges  resulting
from this  conversation,  there  were bank  accounts  over the course of several
months where the Company was not in full compliance with USAP requirements as it
related to the  preparation of custodial bank  reconciliations  with 45 calendar
days of cutoff as well as the resolution of reconciling items within 90 calendar
days of original identification.

The Company  remediated the issues related to the  preparation of custodial bank
accounts  reconciliations  within 45 calendar days as of December 31, 2004.  The
Company has  subsequently,  in 2005,  remediated  the  resolution of reconciling
items within 90 calendar days of original identification.

As of and for the same  period,  the  Company  had in effect  fidelity  bond and
errors and omissions  policies in the amounts of $300,000,000 and  $100,000,000,
respectively.


/s/ David Applegate
-------------------
David Applegate
Chief Executive Officer
GMAC Residential Holding Corp

/s/ Ralph Hall
--------------
Ralph Hall
Chief Operating Officer
GMAC Residential Holding Corp

/s/ Anthony Renzi
--------------
Anthony Renzi
Executive Vice President,
National Servicing Administration
GMAC Residential Holding Corp

/s/ Jim Hillsman
----------------
Jim Hillsman
Chief Financial Officer
GMAC Residential Holding Corp


<PAGE>


                                  EXHIBIT 99.2
                    Annual Servicer's Statement as to Compliance
                                  -----------
GMAC Mortgage Corporation


March 10, 2005

RESIDENTIAL ASSET MORTGAGE PRODUCTS
DIANE WALLACE
c/o JPMORGAN CHASE BANK
4 New York Plaza - 6th Floor
New York, NY  10004-2477

RE:  Annual Officers Statement of Compliance
     Year Ending 2004

     We hereby  certify to the best of our  knowledge  and belief,  that for the
     calendar year 2004:

1.   A  review  of the  activities  of the  Seller/Servicer  and of  performance
     according  to  the   Seller/Servicer   contract  has  been  made  with  the
     undersigned Officer's knowledge.
2.   To the  best of the  undersigned  Officer's  knowledge,  and  based on such
     review,  the  Seller/Servicer has fulfilled all its obligations  under the
     Guides for such year.
3.   If applicable,  GMACM has filed the information returns with respect to the
     receipt of mortgage interest pursuant to Sections 6050H, 5060J and 6050P of
     the Code,  received in a trade or  business,  reports of  foreclosures  and
     abandonment's  of  any  Mortgaged  Property  and  the  information  returns
     relating  to  cancellation  of  indebtedness  income  with  respect  to any
     Mortgaged Property.
4.   All hazard,  flood, FHA mortgage  insurance and primary mortgage  insurance
     premiums,  taxes,  ground rents,  assessments and other lienable items have
     been paid in connection with the mortgaged properties.
5.   All property inspections have been completed as required.
6.   Compliance relative to Adjustable Rate Mortgages has been met.
7.   Fidelity Bond and Errors and Omissions  Insurance  coverage is current,  in
     full force and effect.


Servicer:       GMAC Mortgage Corporation

By:             /s/ Michael Kacergis
                ------------------------
Name:           Michael Kacergis

Title:          Manager, Contract Administration
                National Loan Administration Risk and Compliance

500 Enterprise Road
Suite 150
Horsham, PA 19044