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Thread: 09 CTS-V 4 to 5 shift hard

  1. #1
    Tuner in Training
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    Mar 2018
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    09 CTS-V 4 to 5 shift hard

    Can anyone have a look at the log and file and help me out with the 4 to 5 shift. everything else is smooth. thanks in advance
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  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
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    Rogers, MN
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    8,504
    Back the shift pressure down, you have it way maxed out at 297psi for WOT. I see no reason to have that much requested shift pressure.

    I'd try that, even play with the shift time and pressure presets to get that shift smoother.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  3. #3
    Tuner in Training
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    Mar 2018
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    Thanks for the help ill play with it. It seems these cars like to snap intermediate shafts in the trans so i hope i can get it smoothed out.