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Thread: 5 to 6 speed allison swap

  1. 04-30-2019 #1
    MaroonMonsterLS1
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    5 to 6 speed allison swap

    Has anyone here performed this or does anyone have a good link to a writeup on how to alter the trans tune to allow 6th gear? I know the valve body needs to be changed, but that's no issue for me. I'm just curious about how to make the TCM command 6th gear
    Thanks!!
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  2. 11-08-2023 #2
    71c10chevy
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    Quote Originally Posted by MaroonMonsterLS1 View Post
    Has anyone here performed this or does anyone have a good link to a writeup on how to alter the trans tune to allow 6th gear? I know the valve body needs to be changed, but that's no issue for me. I'm just curious about how to make the TCM command 6th gear
    Thanks!!
    Bump i was trying to find the same post or write up on converting 5spd to 6spd
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