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Thread: 4L80 transmission failure, check my tune

  1. #1

    4L80 transmission failure, check my tune

    I recently had a transmission failure with around 500 miles on a built transmission. My trans builder suggested I have my tune checked to make sure I'm running max line pressure at WOT. Would you guys care to take a look and see if you see anything wrong or make any suggestions??
    Last edited by scooter k; 10-28-2012 at 07:38 PM.

  2. #2
    Advanced Tuner gn2beatu's Avatar
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    You might want to post what failed in the trans, what was happening when it failed. Hard parts, shudder, too hard of shifting, etc, if it failed during shifting, we would look at the shift pressures. Its not always line pressure.
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  3. #3
    When I had issues the transmission got hot, about 260. They said that second gear was wasted but all the other clutches were damaged including the converter from the heat. I was at WOT through all the gears when this happened. This is in a turbo Silverado putting 1000 to the wheels to it's pretty extreme.

  4. #4
    Anyone?

  5. #5
    Guess no one knows?

  6. #6
    Senior Tuner Ben Charles's Avatar
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    took a quick glance, why do you have the shift speed so slow?? Factory is faster than what you have it.

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  7. #7
    Quote Originally Posted by Ben Charles View Post
    took a quick glance, why do you have the shift speed so slow?? Factory is faster than what you have it.
    Well actually I didn't do it! I paid someone because I don't have enough knowledge and experience to do it.

  8. #8
    Senior Tuner Ben Charles's Avatar
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    Neither does the person doing your tune lol

    Email Tunes, [email protected]
    96 TA Blown/Stroked, 4L80E/Fab 9
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    Custom Mid Engine chassis, AKA GalBen C

  9. #9
    I thought he did?? Well if you know of someone.....

  10. #10
    Or who is the trans tune guru on here? I've got my paypal ready!

  11. #11
    Senior Tuner Ben Charles's Avatar
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    Scooter you got a PM

    Email Tunes, [email protected]
    96 TA Blown/Stroked, 4L80E/Fab 9
    15 C7 A8 H/C 2.3 Blower/PI
    14 Gen 5 Viper
    Custom Mid Engine chassis, AKA GalBen C

  12. #12
    Here's what I've changed it too. Shifts pretty hard and fast. Don't really like it but don't want it slipping either. I've driven it really gently and a little scared to run it hard for fear the transmission won't hold up again. Any ideas whether this tune is any good?

  13. #13
    Bumpttt