New Trans For A 65 Mustang

Discussion in '1965 - 1973 Classic Mustangs -General/Talk-' started by Jim Pawloski, Jun 24, 2014.


  1. Jim Pawloski

    Jim Pawloski Member

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    Would like to keep it automatic, but I'll probably be putting 500-600 hp at the crank when this build is done. Would my C4 trans be able to keep up after a rebuild? Or should I move up to a C6? Recommendations welcome!
    #1
  2. Jim Pawloski

    Jim Pawloski Member

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  3. rbohm

    rbohm Founding Member

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    a properly built C4 can handle the power you intend to make. but it wont be just a "rebuild". you are going to have to upgrade the clutches, as well as the bands, and depending on the materials used, some of the internal rotating parts as well. also you are going to have to upgrade the valve body, the input shaft, etc.

    by the way, you will have to do many of the same upgrade with the C6 as well.
    #3
  4. RacerJames

    RacerJames Member

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    I once worked with a guy who ran an Aamco trans shop. He had a Factory 5 Cobra which he ran 9s with at Rocky Mountain Raceways in SL. It was a 5.0 with a paxton setup. He chose to run the C4 trans. Seemed to work fine for him.
    #4
  5. flstang65

    flstang65 Well-Known Member

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    The C6 also takes about 50ish or so horse power just to turn the thing. Super heavy too.
    #5
  6. 65ShelbyClone

    65ShelbyClone Founding Member

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    The AOD is an option that has overdrive.
    #6
  7. Jim Pawloski

    Jim Pawloski Member

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    I'm trying to find a performance rebuild kit for a 65 C4. I guess in 66 they redesigned it so the bell housing bolts to the case, not the pump. I don't know if that changes anything internally.
    #7
  8. flstang65

    flstang65 Well-Known Member

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    I would go with an AOD
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  9. Jim Pawloski

    Jim Pawloski Member

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    Yeah but I don't want to spend 2500 dollars unless I have to. That's why I'm hoping someone has a good lead on a performance rebuild kit for a 65 c4.
    #9
  10. Jim Pawloski

    Jim Pawloski Member

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    #10
  11. 84Ttop

    84Ttop They make new pistons every day, so why worry? SN Certified Technician Mod Dude

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    This answer is spot on!
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  12. Grabber70Mach

    Grabber70Mach Member

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  13. flstang65

    flstang65 Well-Known Member

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    You can get good used Aod's for cheap.
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  14. rbohm

    rbohm Founding Member

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    it will still need upgrading though.
    #14
  15. Jim Pawloski

    Jim Pawloski Member

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    After talking with Performance Automatic, they don't have a rebuild kit that will handle that power for a pre 1970 c4. Looks like I got to buy a new trans anyhow. I'll look into those AODs. Thanks.
    #15
  16. rbohm

    rbohm Founding Member

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    be sure to upgrade the input shafts on an AOD, the stock ones snap quite easily when the power level starts reaching beyond 350hp. also with the AOD, NEVER do full throttle up shifts into O/D as you will burn out the O/D band.
    #16
  17. Jim Pawloski

    Jim Pawloski Member

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    Yeah, I think I'm going to just rebuild the C4 I have now until I can afford the supercharger, then I'll get a new trans when I push over 550 hp
    #17

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