425 transmission
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500, 472, 425, 368 Discussion, 425 transmission in Cadillac Engine Technical Discussion; 79 coupe, what's the transmission on that called? Thanks...
  1. #1
    Mojochiken's Avatar
    Mojochiken is offline Cadillac Owners Member
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    425 transmission

    79 coupe, what's the transmission on that called?
    Thanks

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  3. #2
    eldorado99's Avatar
    eldorado99 is offline Cadillac Owners Connoisseur
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    Re: 425 transmission

    Thats still the TH-400 if I'm not mistaken. (Turbo Hydramatic)

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    Night Wolf's Avatar
    Night Wolf is offline Cadillac Owners 10000+ Posts
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    Re: 425 transmission

    Turbo 400, short tail, BOP-C bell housing.

    Perhaps the best automatic ever made.

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    Mojochiken's Avatar
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    Re: 425 transmission

    Ok, then has anyone had luck with a High-performance Super Street Torque Converter pt# ZX383955Y from JCWhitney?

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    Re: 425 transmission

    Honestly, if you want hi-po parts for the thing (which there is an overabundance of) I woudln't go thru JCWhitney.... check out Jegs or Summit or something, I would think they would have much better brands.

    If you are messing with the torque converter, then I would guess there is already a shift kit in it? Cadillac got the softest shifting calibrations... wears down the clutches more, tho the TH400 really dosn't care... but you can get that thing slamming into gear faster then any manual... of course depending on your goal, you may not want that firm of a shift... all depends on the setup... but stock, even under WOT, hardly feel the shifts.

  7. #6
    davesdeville's Avatar
    davesdeville is offline Banned
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    Re: 425 transmission

    You know, it's interesting that you brought this up.

    On a modern automatic car one of the first modifications is a high stall convertor. Not as much attention is paid to the convertor in older cars, almost none in Caddys. Then again a modern auto will have a lockup convertor and a TH400 won't, so highway economy will suffer. Either way there's no denying the performance benefit, a guy here in Albuquerque went from a 16.5 best to a 15.78 changing to a 3000 stall in his Mark VIII.

    Keep in mind having a really high torque motor will cause the convertor to stall higher than the advertised RPM.

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