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Thread: 6L90 Shift Pattern Type

  1. #1
    Potential Tuner
    Join Date
    Feb 2019

    6L90 Shift Pattern Type

    Alright guys New to tuning the 6 spd trans. I got a deal on a 2011 6.0 2500hd to use as a work truck, knowing it wasn't exactly right. It had a jasper trans put in right before I bought it. It always seems like its in the wrong gear. i read it and the first thing I notice is the Shift Pattern Type is

    Pattern A- Pattn 1
    Pattern B- Normal

    It explicity stated on the editor its recommended not to change these values.

    But shouldn't they be

    Pattern A-Normal
    Pattern B- Trailer

    I know the tcm is in the trans , I wonder if it was just a jasper goof up.

    What are your guys thought?

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Rogers, MN
    Not a goof up. There are several different operating systems and calibrations put into these trucks/transmission and it can differ between model years too.

    A 2011 file can have different settings than a 2012 file. I notice this alot with the GMT-900 platform. My previous 2012 silverado used normal/trailer where as the 2010 truck I owned before that was Pattrn 1 and Eco Mode.

    Just tune the transmission to how you want it to act through all the transmission related tables. Like shift speed, shift timing, pressure presets and shift pressure settings.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.