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Thread: 4t45 t42 help

  1. #1
    Tuner in Training
    Join Date
    Jan 2012
    Posts
    25

    4t45 t42 help

    I have a 2.2 cobalt with a 4t45 can someone point me in the right direction on where i should begin to learn about trans tuning.

  2. #2
    Advanced Tuner
    Join Date
    Apr 2010
    Posts
    223
    x2 please

  3. #3
    Potential Tuner
    Join Date
    Jul 2017
    Posts
    6
    Quote Originally Posted by j27 View Post
    I have a 2.2 cobalt with a 4t45 can someone point me in the right direction on where i should begin to learn about trans tuning.
    First you need to know the initial characteristics of your hard transmission in the factory version. What is the main pair of differential, drive and driving gears (gear ratio). The numbers and letters on the TCM are its part number.