V6 Transmission Swap

Discussion in '1974 - 1978 Mustang II Talk & Tech' started by 22hp, Nov 21, 2011.


  1. 22hp

    22hp New Member

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    Looking to convert a 78 Mustang II with a 2.8 V6/ 4 speed to a C4 automatic. Has anyone out there done this swap?
    I would like to confirm what parts are needed.
    I’m thinking I’ll need; flywheel, torque converter, bell housing, transmission with floor shift linkage, shifter and driveshaft.
    From what I understand the flywheel, torque converter and bell housing can also be sourced from V6 Rangers and Bronco IIs up to 84.
    Anything I’m missing or any other “gotchas”?
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  2. LILCBRA

    LILCBRA Member

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    Tranny cooler unless your radiator has provisions and cooling lines. Also, and someone else can speak up if I am wrong, might need to have a different length driveshaft. I know V8 cars are about 1" different...
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  3. Mstng2

    Mstng2 Founding Member

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    I swapped mine out, you do need an automatic driveline, and a Transcooler as mentioned above. The shifter hole is an exact fit, and for the clutch pedal you simply remove the rod above the pedal remove the pedal and put it back. then just use the same brake pedal, it's smaller than an auto pedal but it's fine. The trans cross member can be re-used for the C4 but you'll need the trans mount (The rubber piece that goes between the crossmember and the transmission.) You'll need a speedo cable specific for the Auto, and also a nuetral saftey switch. (easier to just bypass this but up to you)

    Enjoy!
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  4. 22hp

    22hp New Member

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    Thanks guys, great information, just what I was looking for!
    Will the 302 automatic driveshaft work as well or do I specifically need a v6 automatic driveshaft?
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  5. 78CobraII

    78CobraII Moderator

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    I think that your V6 4-speed driveshaft has a good chance of being 1 inch too long, but its not too big of a deal to get it shortened. The 302 AT driveshaft is probably the correct length.

    Personnly I'd be tempted to use an overdrive trans out of a later Ranger or Explorer with a V6. They aren't exactly known for their durability, but if you are putting it behind a factory 2.8L,it should hold up fine. And there are hipo parts out there for this trans. While you are doing the OD trans though, why not grab the 4.0L OHV engine that goes with it and get both EFI and OD for more performance and mileage?

    Don't the early Ranger and Bronco II actually use the C5? The difference is mostly in the lock up torque converter, but there are some wiring differences between the trans too.
    #5
  6. Blue coyote

    Blue coyote Founding Member

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    The parts from the Ranger/Bronco II/Explorer will work, as long as the donor is a 2wd with the 2wd tailhousing (the 2wd BII uses a "dummy" transfer case) and as long as you use the matching starter for the flexplate.

    Using a C5 out of an early 2wd Ranger is probably the best option, with a lockup torque converter (sort of) acting as an O/D without the reliability issues associated with the A4LD. Personally, I wouldn't even trust an A4LD spec'ed out for a built 4.0. They are based off the marginally self-destructive C3, but with an overdrive AND a lockup converter both adding strain to a POS tranny.
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