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Thread: Topkick 5sp to 6sp conversion

  1. #1
    Lifetime Member Mitco39's Avatar
    Join Date
    Jan 2009

    Default Topkick 5sp to 6sp conversion

    Is it possible to update the software in the TCM to enable 6th gear? From what I am reading it is a simple GM flash, do we have the ability to do that update with EFIlive (way back last time I looked I dont think full flashing was an option). And if so does anyone have a 2008 TCM file that would work.

    Thanks in advance.


  2. #2
    Lifetime Member GMC-2002-Dmax's Avatar
    Join Date
    Dec 2005


    If you get me a VIN# I can get a A50 File from TIS and email it over, I have done a few of them, but its been a few years

    Tuner of many, many Duramax and Cummins Diesels.

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