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Thread: 2007 / 2008 LY6 (6.0 Liter) with 4L65E/4L70E Auto

  1. #1
    Super Moderator dave w's Avatar
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    2007 / 2008 LY6 (6.0 Liter) with 4L65E/4L70E Auto

    I'm wondering if anyone has experience they would like to share on custom flashing a 2007 / 2008 E38 ECM LY6 (6.0 Liter) with a T42 TCM 4L65E/4L70E Auto combination? I'm curious what parameters in E38 ECM will need to be changed to allow using the T42 TCM 4L65E/4L70E Auto flash. EFI Live files attached.

    Maybe there is a Factory Flash combination (VIN#) for 2007 / 2008 LY6 with the 4L65E/4L70E?

    dave w

  2. #2
    You need a 07-08 TCM flashed with a 4L60E OS. Then flash the ECM with a tune from a 4 speed vehicle. Manual and 6 speed tunes will not work.
    Doing that will make the ECM and TCM talk to each other, read the file and start tuning.

  3. #3
    Super Moderator dave w's Avatar
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    Quote Originally Posted by Montecarlodrag View Post
    You need a 07-08 TCM flashed with a 4L60E OS. Then flash the ECM with a tune from a 4 speed vehicle. Manual and 6 speed tunes will not work.
    Doing that will make the ECM and TCM talk to each other, read the file and start tuning.
    Thanks, It appears I have the files I need posted.

    dave w

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