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Thread: I need help tunning my 8l90 trans

  1. 04-13-2022 #1
    JIMMY84
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    I need help tunning my 8l90 trans

    hi guys im new to the group. I did a 2018 5.3 8l90 swap on my97 obs tahoe im running 22x14 forged wheels and im having issues with the transmission locking up at 75-80 mph the over drive locks on and off it feels like the engine looses power and the DOD is already disabled any help would be greatly appreciated
    Last edited by JIMMY84; 04-13-2022 at 09:58 AM.
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  2. 04-13-2022 #2
    Ben Charles
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    Post the tune, what gear ratio? The entire shift scheduling needs adjusted for that setup along with TCC lock settings due to tire size and gear ratio

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  3. 04-16-2022 #3
    JIMMY84
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    thank you for the responce!

    Quote Originally Posted by Ben Charles View Post
    Post the tune, what gear ratio? The entire shift scheduling needs adjusted for that setup along with TCC lock settings due to tire size and gear ratio
    35x13.50x22 390 gears

    96 tahoe 4x4 5.3 8l90 on 22x14 35x13.50x22.hpt
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