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Thread: th350/400 engine rpm capability

  1. #1
    Member MASTER JOURNEYMAN
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    th350/400 engine rpm capability

    What can these transmissions take as far as engine speed goes? I will be putting a th350 behind an engine that will be capable of revving to 8.5k+ and just want to know if they will survive at engine speeds that high. Thanks guys.

  2. #2
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    How long a time at that rpm ?

    Drag ? Hard acceleration for short time

    Mile ? Hard acceleration for 1 mile

    Road race track ? Hard acceleration / decceleration - up / down shifting

    Open road race(endurance) ? High speed for extended time
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  3. #3
    Member MASTER JOURNEYMAN
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    Hard acc for a short time, wouldn't be taking it that high all of the time, esp on the street.

  4. #4
    Senior Member RACING JUNKIE
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    It is just not about engine RPM. Personally, if it is a heavier street/strip car, I would pass on the 350 and go for a 400 that has been built to maintain your application. Don't get me wrong, a 350 serves the purpose, but a 400 will take more abuse.

  5. #5
    Member JUNIOR BUILDER
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    I used to have an engine that was turned in excess of 9k with a T400 behind it for a few years.It seemed ok,the trans I felt didn't seem to require an extraordinary amount of maintainance.

  6. #6
    Senior Member MASTER BUILDER
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    If you're building the car for drag racing - get a TH400 and rebuild it with drag parts. A standard TH350 or even a TH400 won't handle hard out drag racing for too long.
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  7. #7
    Senior Member DYNO OPERATOR
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    I have been rcaing with my th400 since 96 and have had it rebuilt only once. It's behind a 455 Pontiac. My brother has a 72 Nova with a 406 and he goes thru 3 th400 a year. They don't like HIGH rpm's. 6500 max on a th400.

  8. #8
    Junior Member SHOW GUEST
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    Quote Originally Posted by CamBirdRacing
    I have been rcaing with my th400 since 96 and have had it rebuilt only once. It's behind a 455 Pontiac. My brother has a 72 Nova with a 406 and he goes thru 3 th400 a year. They don't like HIGH rpm's. 6500 max on a th400.
    if that's all it can handle you better junk it or find a better builder.

  9. #9
    Senior Member DYNO OPERATOR
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    Quote Originally Posted by mreese
    Quote Originally Posted by CamBirdRacing
    I have been rcaing with my th400 since 96 and have had it rebuilt only once. It's behind a 455 Pontiac. My brother has a 72 Nova with a 406 and he goes thru 3 th400 a year. They don't like HIGH rpm's. 6500 max on a th400.
    if that's all it can handle you better junk it or find a better builder.

    I keep telling him to put a p/g in it. Some people just won'tl isten.

  10. #10
    Senior Member EXPERT BUILDER
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    i agree FIND A DIFFERENT BUIDLER!!!!!!!!


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