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Engine trans swap question

Discussion in 'The "X" bodies' started by PaTerry, Jan 29, 2020.

  1. PaTerry

    PaTerry New Member

    I know the buick 350 is a direct swap from my 231. My questions is, is anyone running a th400? I just picked up a 350-4 with 60k on it and still hooked up was a th400 with nice clean fluid awesome $200 score. Trying to figure out if I should split it and just install the motor or stab it in as one. My concerns are yoke size, overall clearance, I think the trans mount will work but not 100%.

    I do know that the electra manifolds will not work just by eyeball so what manifolds do I need to be looking for
     
  2. Bens99gtp

    Bens99gtp Well-Known Member

    400 require different output shafts and different length shafts, plus you will need to work around the electric kickdown too
     
  3. sean Buick 76

    sean Buick 76 Buick Nut

    To swap to a 400 trans you will need to re-locate the trans cross-member as well. The Parking brake will need to be modified or switched. You would need a custom driveshaft.

    What trans do you have in the car now?

    A Th-350 would be what I would use if it has a metric 200 trans. But maybe it already has a Th-350 trans I am not familiar with which trans came behind those V6 engines in that year.

    Take a pic of the trans pan if you are not sure which trans you have.
     
  4. partsrparts

    partsrparts Silver Level contributor

    I put a 1968 350 and th400 in my 76 skylark, stab them in 1 shot, move the cross member back to the next set of holes, you'll need a different yoke and shorten the drive shaft, I had no issues with my e-brake. they make a elec. kick down that bolts to your throttle linkage at the carb but I put in a floor shifter and just down shift manually.
     

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