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Thread: Normal/pattern A/Pattern B Shift speeds

  1. #1

    Normal/pattern A/Pattern B Shift speeds

    Does anyone know what the differences or definitions are for the different shift speed parameters. I am referring to Part throttle shift tabs...Normal/Pattern A/Pattern B. I would like to know what makes the computer decide which one to use. Trans is a 4L60E out of a 08 Silverado.

  2. #2
    Tuning Addict 5FDP's Avatar
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    Having not tried this, are you able to log the shift pattern itself in the channels list to see what one it's using.

    Anytime the vehicle is in drive, it's using the normal table for everything. I wonder if the shift selector was in D3 or D2 if it changes the pattern to a or b. Though I think most of the time they use the same numbers.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  3. #3
    Advanced Tuner
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    Quote Originally Posted by Howedeman View Post
    Does anyone know what the differences or definitions are for the different shift speed parameters. I am referring to Part throttle shift tabs...Normal/Pattern A/Pattern B. I would like to know what makes the computer decide which one to use. Trans is a 4L60E out of a 08 Silverado.
    Some of the patterns GM has used on the 4L60E that come to mind.

    Normal
    Tow/Haul
    HOT (Transmission Overheating)
    Cruise (Cruise Control Enabled)
    Economy (MPG)

  4. #4
    Standard mode in Drive is pattern A, tow haul should be B

  5. #5
    Tuner in Training
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    Question on shift patterns 6l90e 2008 suburban..... and 1-2 shift example
    Normal 7mph
    Pattern A 10mph
    Pattern B 13mph
    Hot 11mph

    Which is the pattern for the different modes? or combos of?
    Drive
    Towing
    And if these change anything
    Traction off
    Stabil Off

    I keep reading conflicting info

    thank you

  6. #6
    Tuner in Training
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    "Trans Shift Mode" in the VCM scanner should tell you this.
    For me D is Normal, Tow/Haul is Pattern A, and M is TUTD.

    Pull that up in the scanner and start pushing buttons and see what happens. I have not found that traction control or stabilitrac changes the pattern.
    2014 Silverado L83 - Knockoff S366 Turbo - LT1 Fuel Pump and Injectors