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Ford: Transmission Question Mustang 71

  1. #1
    ddocken
    Guest

    Transmission Question Mustang 71

    My son has a 351c 1971 Mustang Grandé (looks like a fastback).
    We need an automatic transmission. The guy he talked to asked if the
    transmission has a steel case (fmx tranny). So, he put a magnet on it and it
    was steel. He said this is an expensive tranny to fix, buy and find. so he
    offers to rebuild it w/towing for a hefty fee.
    My question is: what models of automatic transmissions w/fit in it and
    either slightly or not have to be modified, or is he yankin' his chain.
    Thanx in advance,
    Doug


  2. #2
    Falcoon
    Guest

    Re: Transmission Question Mustang 71

    a C-6 will bolt rite up to the 351C and is a lot easyier to find and fix

  3. #3
    Thomas
    Guest

    Re: Transmission Question Mustang 71

    You mean a C4, as that the 351 has the small block transmission bolt
    configuration.
    "Falcoon" <com> wrote in message
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  4. #4
    Thomas
    Guest

    Re: Transmission Question Mustang 71

    C4 will bolt to it. The FMX is not all that hard to find nor is real expensive
    to recondition. Suggest you check around.
    "ddocken" <net> wrote in message
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  5. #5
    Louis
    Guest

    Re: Transmission Question Mustang 71

    On Sat, 6 Sep 2003 19:30:32 -0400, "Thomas Moats" <com>
    wrote:
     


    Not to mention that a C4 isn't exactly horrible to rebuild,
    (assuming you get a good tranny book & the right tools, )
    -LMB
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  6. #6
    geewhiz@bob2000antispam.com
    Guest

    Re: Transmission Question Mustang 71

    Thomas Moats wrote: 

    C6's come in small-block patterns as well.

    Gerard
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  7. #7
    geewhiz@bob2000antispam.com
    Guest

    Re: Transmission Question Mustang 71

    ddocken wrote: 

    Did he put the magnet on the CASE, rather than the trans pan? All stock pans
    are steel...Another feature of the FMX is that it has ears and 4 external bolts
    holding it to the bellhousing. I disagree with the above statement of the trans
    being expensive to repair and to find...there are still many tens of thousands
    of them still running in all types of 60's and 70's Fords.

    Anyhow, any good transmission shop should have no problems rebuilding an FMX,
    C4, or C6 transmission, whichever you have or you choose. With a stock engine,
    the FMX is a fine unit, and should give years of good service.

    Gerard
    ASE Certified Master Auto Tech
    Ford Trans specialist
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  8. #8
    lugnut
    Guest

    Re: Transmission Question Mustang 71

    On Sat, 06 Sep 2003 11:56:17 -0500, ddocken
    <net> wrote:
     


    The FMX seems to be more expensive to build because they
    generally sustain more damage in a failure. The FMX is a
    strong reliable trans. A good shop should be able to build
    it unless the case is damaged which was not uncommon for
    them. The C4 trans is the aluminum unit used in many of
    those cars and will get the job done. It will not stand the
    abuse that a C6 can behind that engine. The C6 is a bit
    heavier that the C4 and requires a bit more engine power to
    handle it. As long as the case is not damaged and the car
    is driven sanely(?), I would opt to build the FMX. The
    others will require other mods to complete the job which
    will add to repair cost. If money is no problem and it is a
    performance vehicle, the field is wide open for
    improvements.

  9. #9
    Jason
    Guest

    Re: Transmission Question Mustang 71


    "lugnut" <net> wrote in message
    news:com...
     

    Also the FMX has a feature which is invaluable coupled to a 351c in traffic
    ie it can take-off in 2nd if you so desire and stays in 2nd, so there's no
    change-up--stop--moveoff-change up etc etc.

    Jason



  10. #10
    Thomas
    Guest

    Re: Transmission Question Mustang 71

    But are VERY hard to find. Because of that expensive.
    <com> wrote in message
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