EXHIBIT 99.4
 
                               GROVE HOLDINGS LLC
                          GROVE HOLDINGS CAPITAL, INC.
 
                              OFFER TO EXCHANGE THEIR
 
    11 5/8% SENIOR DISCOUNT DEBENTURES DUE 2009, WHICH HAVE BEEN REGISTERED
 
     UNDER THE SECURITIES ACT OF 1993, AS AMENDED, FOR ANY AND ALL OF THEIR
                              OUTSTANDING 11 5/8%
 
                      SENIOR DISCOUNT DEBENTURES DUE 2009
 
To Securities Dealers, Commercial Banks,
 
Trust Companies and Other Nominees:
 
    Enclosed for your consideration is a Prospectus dated       , 1998 (as the
same may be amended or supplemented from time to time, the "Prospectus") and a
form of Letter of Transmittal (the "Letter of Transmittal") relating to the
offer (the "Exchange Offer") by Grove Holdings LLC, a Delaware limited liability
company (the "Company" or "Grove"), and Grove Holdings Capital, Inc., a Delaware
corporation and a wholly owned subsidiary of the Company ("Grove Capital" and,
together with the Company, the "Issuers") to exchange up to $88,000,000 in
aggregate principal amount at maturity of their 11 5/8% Senior Discount
Debentures due 2009 (the "Exchange Debentures") for up to $88,000,000 in
aggregate principal amount at maturity of their outstanding 11 5/8% Senior
Discount Debentures due 2009 of the Issuers (the 'Senior Discount Debentures')
that were issued and sold in a transaction exempt from registration under the
Securities Act of 1933, as amended.
 
    We are asking you to contact your clients for whom you hold Senior Discount
Debentures registered in your name or in the name of your nominee. In addition,
we ask you to contact your clients who, to your knowledge, hold Senior Discount
Debentures registered in their old name. The Issuers will not pay any fees or
commissions to any broker, dealer or other person in connection with the
solicitation of tenders pursuant to the Exchange Offer. You will, however, be
reimbursed by the Issuers for customary mailing and handling expenses incurred
by you to forwarding any of the enclosed materials to your clients. The Issuers
will pay all transfer taxes, if any, applicable to the tender of Senior Discount
Debentures to it or its order, except as otherwise provided in the Prospectus
and the Letter of Transmittal.
 
    Enclosed are copies of the following documents:
 
        1. the Prospectus;
 
        2. a Letter of Transmittal for your use in connection with the exchange
    of Senior Discount Debentures and for the information of your clients
    (facsimile copies of the Letter of Transmittal may be used to exchange
    Senior Discount Debentures);
 
        3. a form of letter that may be sent to your clients for whose accounts
    you hold Senior Discount Debentures registered in your name or the name of
    your nominee, with space provided for obtaining the clients' instructions
    with regard to the Exchange Offer;
 
        4. a Notice of Guaranteed Delivery; and
 
        5. guidelines of the Internal Revenue Service for Certification of
    Taxpayer Identification Number on Substitute Form W-9.
 
    YOUR PROMPT ACTION IS REQUESTED. THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M.
NEW YORK CITY TIME ON       , 1998, UNLESS EXTENDED (THE "EXPIRATION DATE").
SENIOR DISCOUNT DEBENTURES TENDERED PURSUANT TO THE EXCHANGE OFFER MAY BE
WITHDRAWN, SUBJECT TO THE PROCEDURES DESCRIBED IN THE PROSPECTUS, AT ANY TIME
PRIOR TO THE EXPIRATION DATE.
 
    To tender Senior Discount Debentures, certificates for Senior Discount
Debentures or a Book-Entry Confirmation (as defined in the Prospectus), a duly
executed and properly completed Letter of Transmittal

or a facsimile thereof, and any other required documents, must be received by
the Exchange Agent as provided in the Prospectus and the Letter of Transmittal.
 
    If a holder desires to accept the Exchange Offer and time will not permit a
Letter of Transmittal or Senior Discount Debenture to reach the Exchange Agent
before the Expiration Date or the procedure for book-entry transfer cannot be
completed on a timely basis, a tender may be effected by delivery of a Notice of
Guaranteed Delivery by an Eligible Institution (as defined in the Prospectus).
 
    Any inquiries you may have with respect to the Exchange Offer or requests
for additional copies of the enclosed material may be directed to the Exchange
Agent at its address or telephone number set forth in the Prospectus.
 
                                          Very truly yours,
 
                                          GROVE HOLDINGS LLC and
 
                                          GROVE HOLDINGS CAPITAL, INC.
 
NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU OR
ANY PERSON AS AN AGENT OF THE ISSUERS OR THE EXCHANGE AGENT, OR ANY AFFILIATE
THEREOF, OR AUTHORIZE YOU OR ANY OTHER PERSON TO MAKE ANY STATEMENTS OR USE ANY
DOCUMENT ON BEHALF OF ANY OF THEM WITH RESPECT TO THE EXCHANGE OFFER, EXCEPT FOR
THE ENCLOSED DOCUMENTS AND THE STATEMENTS EXPRESSLY MADE IN THE PROSPECTUS AND
THE LETTER OF TRANSMITTAL.