1998 Gt Tranny Swap From A 2003 Gt

Discussion in 'SN95 4.6L Mustang Tech' started by dylan sharkey, Apr 3, 2014.


  1. dylan sharkey

    dylan sharkey New Member

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    So my 4r70w auto tranny blew up in my 1998 mustang gt and i found a tranny from a 2003 gt. i need to know if that tranny will work in the 1998 gt please help!
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  2. wmburns

    wmburns SN Certified Technician

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    Are you expecting a "plug and play" swap? If so, this isn't it.

    The 99+ model year uses the OSS speed sensor.

    The 98 and older uses a VSS speed sensor.

    The output of the VSS and OSS sensor are NOT compatible to each other. The wiring is different as well as the signal type.

    Not to mention the 4R70W is an electronically controlled transmission and there are differences in the controls.

    Expect problems if this swap is done.
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  3. classypeopleracing

    classypeopleracing New Member

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    what all would be needed to do this swap correctly?
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  4. wmburns

    wmburns SN Certified Technician

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    Swap tail shafts. But the OSS sensor is pressed onto the output shaft. Will need to press off the OSS sensor and press on a VSS worm gear. Of course this will require that the output shaft be removed so that it will fit in the press.

    Swap external transmission wiring harness.

    Swap circuit boards.

    Throw some salt over your shoulder. In the end you may wish you just had the unit that came with the car re-built.

    Consider getting yourself a Ford service manual. This will give some guidance how to disassemble and re-assemble. If interested in getting a copy for yourself I may be able to help. PM if interested.

    Good luck.
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