SECURITIES AND EXCHANGE COMMISSION
                     WASHINGTON, D.C.  20549

                            FORM S-6

 For Registration Under the Securities Act of 1933 of Securities
       of Unit Investment Trusts Registered on Form N-8B-2

A.   Exact Name of Trust:             THE FIRST TRUST GNMA
                                      REINVESTMENT INCOME TRUST
                                      "GRIT" SERIES 98

B.   Name of Depositor:               FIRST TRUST PORTFOLIOS L.P.

C.   Complete Address of Depositor's  1001 Warrenville Road
     Principal Executive Offices:     Lisle, Illinois  60532

D.   Name and Complete Address of
     Agents for Service:              FIRST TRUST PORTFOLIOS L.P.
                                      Attention:  James A. Bowen
                                      Suite 300
                                      1001 Warrenville Road
                                      Lisle, Illinois  60532

                                      CHAPMAN & CUTLER LLP
                                      Attention:  Eric F. Fess
                                      111 West Monroe Street
                                      Chicago, Illinois  60603

E.   Title of Securities
     Being Registered:                An indefinite number of
                                      Units pursuant to Rule
                                      24f-2 promulgated under
                                      the Investment Company Act
                                      of 1940, as amended.

F.   Approximate Date of Proposed
     Sale to the Public:              ____ Check if it is
                                      proposed that this filing
                                      will become effective on
                                      _____ at ____ p.m.
                                      pursuant to Rule 487.

     The registrant hereby amends this Registration Statement  on
such  date  or  dates as may be necessary to delay its  effective
date  until  the registrant shall file a further amendment  which
specifically  states  that  this  Registration  Statement   shall
thereafter  become effective in accordance with Section  8(a)  of
the  Securities  Act of 1933 or until the Registration  Statement
shall  become  effective on such date as the  Commission,  acting
pursuant to said Section 8(a), may determine.



        Preliminary Prospectus Dated April 26, 2005

  The First Trust GNMA Reinvestment Income Trust "GRIT",
                         Series 98


10,000 Units                       (A Unit Investment Trust)

     The  attached final Prospectus for a prior  Series  of
the Fund is hereby used as a preliminary Prospectus for the
above   stated  Series.   The  narrative  information   and
structure  of  the  attached  final  Prospectus   will   be
substantially the same as that of the final Prospectus  for
this  Series.   Information with respect  to  pricing,  the
number  of  Units, dates and summary information  regarding
the  characteristics of securities to be deposited in  this
Series  is  not  now available and will be different  since
each  Series  has  a  unique  Portfolio.   Accordingly  the
information  contained herein with regard to  the  previous
Series   should  be  considered  as  being   included   for
informational  purposes only. Ratings of the securities  in
this  Series are expected to be comparable to those of  the
securities deposited in the previous Series.

     A registration statement relating to the units of this
Series  will  be  filed  with the Securities  and  Exchange
Commission  but has not yet become effective.   Information
contained  herein  is subject to completion  or  amendment.
Such  Units  may  not be sold nor may an offer  to  buy  be
accepted  prior  to  the  time the  registration  statement
becomes effective.  This Prospectus shall not constitute an
offer  to sell or the solicitation of an offer to  buy  nor
shall  there be any sale of the Units in any state in which
such offer, solicitation or sale would be unlawful prior to
registration or qualification under the securities laws  of
any  such state.  (Incorporated herein by reference is  the
final  prospectus  for  The First Trust  GNMA  Reinvestment
Income  Trust  "GRIT",  Series 97  (Registration  No.  333-
121667)  as filed on January 20, 2005, which shall be  used
as  preliminary prospectus for the current  series  of  the
Fund.)


                           MEMORANDUM


   RE:  THE FIRST TRUST GNMA REINVESTMENT INCOME TRUST "GRIT",
                            SERIES 98

     The  only  difference  of consequence (except  as  described
below)  between The First Trust GNMA Reinvestment  Income  Trust,
Series  97,  which is the current fund, and The First Trust  GNMA
Reinvestment Income Trust "GRIT", Series 98, the filing of  which
this  memorandum accompanies, is the change in the series number.
The  list  of  securities comprising the  Fund,  the  evaluation,
record  and  distribution  dates  and  other  changes  pertaining
specifically to the new series, such as size and number of  Units
in  the  Trust and the statement of condition of the  new  Trust,
will be filed by amendment.


                            1940 ACT


                      FORMS N-8A AND N-8B-2

     These forms were not filed, as the Form N-8A and Form N-8B-2
filed in respect of The First Trust GNMA Fund, Series 1 (File No.
811-3969) related also to the subsequent series of the Trust.


                            1933 ACT


                           PROSPECTUS

     The  only  significant changes in the  Prospectus  from  the
Series 97 prospectus relate to the series number and size and the
date  and various items of information which will be derived from
and apply specifically to the securities deposited in the Trust.


                CONTENTS OF REGISTRATION STATEMENT


Item A.   Bonding Arrangements of Depositor:

          First Trust Portfolios, L.P. is covered by a Brokers'
          Fidelity Bond, in the total amount of $2,000,000, the
          insurer being National Union Fire Insurance Company of
          Pittsburgh.

Item B.   This Registration Statement on Form S-6 comprises the
          following papers and documents:

          The facing sheet

          The Prospectus

          The signatures

          Exhibits


                               S-1

                           SIGNATURES

     Pursuant to the requirements of the Securities Act of  1933,
the  Registrant, The First Trust GNMA Reinvestment  Income  Trust
"GRIT", Series 98, has duly caused this Registration Statement to
be  signed  on  its  behalf  by the undersigned,  thereunto  duly
authorized,  in  the Village of Lisle and State  of  Illinois  on
April 26, 2005.

                              THE FIRST TRUST GNMA REINVESTMENT
                              INCOME TRUST "GRIT", SERIES 98
                             (Registrant)

                              By: FIRST TRUST PORTFOLIOS, L.P.
                                     (Depositor)


                              By: Jason T. Henry
                                  Senior Vice President


                               S-2

     Pursuant to the requirements of the Securities Act of  1933,
this  Amendment  to the Registration Statement  has  been  signed
below  by  the following person in the capacity and on  the  date
indicated:

       NAME                 TITLE*                 DATE


Judith M. Van Kampen       Director            )
                           of The Charger      )
                           Corporation, the    )April 26, 2005
                           General Partner of  )
                           First Trust         )
                           Portfolios, L.P.    )

Karla M. Van Kampen-Pierre Director            )
                           of The Charger      )
                           Corporation, the    )Jason T. Henry
                           General Partner of  )Attorney-in-Fact**
                           First Trust         )
                           Portfolios, L.P.    )

David G. Wisen             Director            )
                           of The Charger      )
                           Corporation, the    )
                           General Partner of  )
                           First Trust         )
                           Portfolios, L.P.    )


       *     The title of the person named herein represents  his
       or  her  capacity  in  and  relationship  to  First  Trust
       Portfolios, L.P., Depositor.

       **    An  executed copy of the related power  of  attorney
       was  filed with the Securities and Exchange Commission  in
       connection with the Amendment No. 1 to Form S-6 of FT  597
       (File  No.  333-76518) and the same is hereby incorporated
       herein by this reference.


                               S-3

                       CONSENTS OF COUNSEL

     The  consents  of counsel to the use of their names  in  the
Prospectus  included  in  this  Registration  Statement  will  be
contained  in their respective opinions to be filed  as  Exhibits
3.1 and 3.3 of the Registration Statement.


         CONSENT OF SECURITIES EVALUATION SERVICE, INC.

     The  consent of Securities Evaluation Service, Inc.  to  the
use  of  its name in the Prospectus included in this Registration
Statement  will  be  filed  as Exhibit 4.1  to  the  Registration
Statement.


CONSENT OF STANDARD & POOR'S RATINGS GROUP, A DIVISION OF MCGRAW-
                           HILL, INC.

     The  consent of Standard & Poor's Ratings Group, A  Division
of  McGraw-Hill,  Inc. to the use of its name in  the  Prospectus
included in this Registration Statement will be filed as  Exhibit
4.2 to the Registration Statement.


                CONSENT OF DELOITTE & TOUCHE LLP

     The  consent of Deloitte & Touche LLP to the use of its name
and  to the reference to such firm in the Prospectus included  in
this Registration Statement will be filed by Amendment.


                               S-4

                          EXHIBIT INDEX

1.1   Form  of  Standard Terms and Conditions of  Trust  for  The
      First   Trust   GNMA,  Series  62  and  subsequent   Series
      effective  December 19, 1991 among First Trust  Portfolios,
      L.P.,  as  Depositor,  The Bank of  New  York  as  Trustee,
      Securities  Evaluation  Service, Inc.,  as  Evaluator,  and
      First   Trust   Advisors   L.P.  as  Portfolio   Supervisor
      (incorporated by reference to Amendment No. 1 to  Form  S-6
      [File  No.  33-44532] filed on behalf of  The  First  Trust
      GNMA, Series 62).

1.1.1*Form  of  Trust  Agreement  for Reinvestment  Income  Trust
      "GRIT",  Series 98 among First Trust Portfolios,  L.P.,  as
      Depositor,  The  Bank  of New York, as Trustee,  Securities
      Evaluation  Service, Inc., as Evaluator,  and  First  Trust
      Advisors L.P., as Portfolio Supervisor.

1.2   Copy  of Certificate of Limited Partnership of First  Trust
      Portfolios,   L.P. (incorporated by reference to  Amendment
      No.  1  to Form S-6 [File No. 33-42683] filed on behalf  of
      The First Trust Special Situations Trust, Series 18).

1.3   Copy  of Amended and Restated Limited Partnership Agreement
      of   First   Trust   Portfolios,   L.P.  (incorporated   by
      reference  to  Amendment No. 1 to Form S-6  [File  No.  33-
      42683]   filed  on  behalf  of  The  First  Trust   Special
      Situations Trust, Series 18).

1.4   Copy   of   Articles  of  Incorporation  of   The   Charger
      Corporation,   the   general   partner   of   First   Trust
      Portfolios,  L.P., Depositor (incorporated by reference  to
      Amendment  No. 1 to Form S-6 [File No. 33-42683]  filed  on
      behalf  of The First Trust Special Situations Trust, Series
      18).

1.5   Copy  of  By-Laws of The Charger Corporation,  the  general
      partner   of  First  Trust  Portfolios,   L.P.,   Depositor
      (incorporated by reference to Amendment No. 1 to  Form  S-6
      [File  No.  33-42683] filed on behalf of  The  First  Trust
      Special Situations Trust, Series 18).

1.6   Underwriter   Agreement  (incorporated  by   reference   to
      Amendment  No. 1 to Form S-6 [File No. 33-43289]  filed  on
      behalf of The First Trust Combined Series 145).

2.1   Copy  of  Certificate of Ownership (included in Exhibit  1.1
      filed herewith on page 2 and incorporated herein by reference).


                               S-5

2.2   Copy  of  Code  of  Ethics (incorporated  by  reference  to
      Amendment No. 1 to form S-6 [File No. 333-31176]  filed  on
      behalf of FT 415).

3.1*  Opinion  of  counsel  as to legality  of  securities  being
      registered.

3.3*  Opinion  of  counsel as to New York income  tax  status  of
      securities being registered.

4.1*  Consent of Securities Evaluation Service, Inc.

6.1   List  of  Directors  and Officers of  Depositor  and  other
      related   information   (incorporated   by   reference   to
      Amendment  No. 1 to Form S-6 [File No. 33-42683]  filed  on
      behalf  of The First Trust Special Situations Trust, Series
      18).

7.1   Power of Attorney executed by the Directors listed on  page
      S-3   of  this  Registration  Statement  (incorporated   by
      reference  to  Amendment  No.  1  to  Form  S-6  [File  No.
      333-76518] filed on behalf of FT 597).


________________________
*    To be filed by amendment.



                               S-6