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how much power can a 6spd hold?

This is a discussion on how much power can a 6spd hold? within the Manual Transmission forums, part of the Drivetrain category; Ok i have a lot of questions here. I have a '99 Z28 6spd. I'm on the way to having ...

  1. #1
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    how much power can a 6spd hold?

    Ok i have a lot of questions here. I have a '99 Z28 6spd. I'm on the way to having full bolt ons soon and then after that i'm getting a heads/cam package. So i figure with full bolt ons and h/c should put me around 400+rwhp. What i need to know is how will this affect my trans. What is it rated for? Will i need to beef it up in some way?
    I have 75k on the car. I bought it with 60k and assume its the stock clutch. Should i keep the stock clutch in their until it craps out or do i get a better one at the same time as h/c? And yes i know i will be in the market for a 12 bolt after all that. Thanks!
    Last edited by 99blueZ; 07-25-2006 at 06:44 PM.

  2. #2
    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
    1998-SS, 2010 Jetta TDI

    600 RWHP i've heard

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    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
    1998-SS, 2010 Jetta TDI

    all you will need to beef up is the clutch, the mechanics of the trasmission should hold till 600RWHP comes around

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    Are you stating a warranty extension? At 600 HP( transmissions only see torque BTW) it is not going to last long, if you use it. The trans is rated at 400 lb-ft of totque stock.

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    no i don't have any warranty. I was just wondering what i will have to do to my trans if i put that much power up against it.

  6. #6
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    2001 Camaro Z28

    My 01 camaro makes 393 RWHP, and about 380TQ I lost second gear shortly after the motorwork was done. car was driven hard though.

  7. #7
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    I dont have huge miles on mine....but Im putting 735 rwhp + on mine, and its holding so far.
    Its an 01 Camaro SS T56, bought used for my conversion.

  8. #8
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    Some 2 years ago We built in our workshop a close ratio T56 6 speed for a Drift Ute, the challenge was to build a reliable T56 that would hold over 900 rwhp. The transmission was built with ratios of 2.66,1.78,1.3,1.0,.80,.62 and it was fitted with a 31 spline mainshaft and a direct couple shift. This ute has had over 50 meetings and it has held up with an amazing 1022 rwhp. We have dozens of High/Performance Road and Race cars here in Australia running big HP through the T56 6 speed, these transmissions are truely amazing. Mal

  9. #9
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    allllllllll black
    2002 35th z28

    IVE SEEN OVER 500 RWHP EASILY WITH JUST A RAM CLUTCH..and ive seen them break bone stock.........its all in how you treat it...AND PS. full bolt ons tune and h/c will net you way more than 400rwhp if you are smart.....and you seem smart

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