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Thread: Engine Stalls Out - Suspect Torque Converter?

  1. #1
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    Engine Stalls Out - Suspect Torque Converter?

    Hello all,
    New User here, thank you for the add!

    I have a 64 Buick Electra 225 w/401 & ST400

    Engine starts and runs fine and actually drives fine. It's the initial launch where I have a problem. Looking for thoughts/ideas of cause.


    When I shift from Park to Drive, the engine stalls out completely. It's as though the trans is bogging the car down. I say that because if I park it on downhill and start the car in Neutral and let it roll a bit, it studders but eventually takes off fine.

    Also, once I'm driving but coming to a stop light, it takes all my might to hold that brake to keep the car from rolling forward.

    I suspected the Torque Converter is in full lockup so started checking transmission things; detent switch adjustment, fluid. But no change. ( I have not changed the fluid, but it looks/smells ok).

    Looking for ideas or what I might try next,

    Thanks !

    WanSolve

  2. #2
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    a ST-400 is basically a TH-400 with a switch pitch torque convertor.

    therefore, for service purposes, the 1966 Chassis Manual should apply to your transmission:
    https://www.teambuick.com/reference/...ssis/index.php

    you're looking for page 74-156
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  3. #3
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    '64 TH400's DID NOT have switch pitch converters the 1st. year.
    Tom Telesco
    Classic and Muscle Automotive
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    Norwalk, CT 06853-1601
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