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How are T56's holding up?

This is a discussion on How are T56's holding up? within the Manual Transmission forums, part of the Drivetrain category; Assuming it is not powershifted or shifted over 6200rpm, or bridled with anything more than bolt-on LS1 power, how long ...

  1. #1
    Member stanger88's Avatar
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    Black on black.
    2001 WS6 M6 (stock)

    How are T56's holding up?

    Assuming it is not powershifted or shifted over 6200rpm, or bridled with anything more than bolt-on LS1 power, how long can I expect my T56 to last (mile-wise) before it goes out?

  2. #2
    Senior Member JonB's Avatar
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    It all depends. T-56's are pretty solid trannies they can take some abuse its more the stock clutch that is the weak link. There are alot fast t56 cars out there of course there not stock t56s either. I got 94,000 on mine and I beat on it all the time. A stock t56 can more than handle a bolt on ls1 assuming its well taken care of.

  3. #3
    Senior Member Danger731's Avatar
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    Over 100k without major abuse. Abused like mine you get 75k. Same tranny in the Auston-Martin. Synchros, shift forks seems to be the common areas to go first.
    04 C5 A4 Torch Red

    2009 CTS4 Ice Black

    2013 1500 Silverado Z71

    02 Z/28 M6 Onyx Black All Options - Sold

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    🤔 11s. blackbirdbrain89's Avatar
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    black trans am
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    yeap one day ull hit 4th hard and it will get stuck.... then it will start poping ou of 3rd and then start grinding gears in 3 and 4th...... if u put a new upgrade shift fork in ull be set for life as long as u dont make over 600 hp


    note the t56 comes in
    f bodys
    mustang cobra
    viper
    db9
    srt 10 ram
    gto
    and shears meany parts with vets

  5. #5
    LTX N20LT4's Avatar
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    10's N/A

    On my old '97 SS, my stock T-56 was good between the 450rwhp-485rwhp mark. As soon as I upped the boost and tipped over 500rwhp it wen't Kaboom. This was with regular to occasional drag use though.

  6. #6
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    Quote Originally Posted by blackbirdbrain89 View Post
    yeap one day ull hit 4th hard and it will get stuck.... then it will start poping ou of 3rd and then start grinding gears in 3 and 4th...... if u put a new upgrade shift fork in ull be set for life as long as u dont make over 600 hp


    note the t56 comes in
    f bodys
    mustang cobra
    viper
    db9
    srt 10 ram
    gto
    and shears meany parts with vets
    And Cadillac CTS-V

  7. #7
    Member stanger88's Avatar
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    Quote Originally Posted by Cutlass View Post
    And Cadillac CTS-V
    and the Qvale Mangusta (sp*) IIRC, but I get the point

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