Results 1 to 3 of 3

Thread: 2015 6L80e (Silverado 5.3L) Shifts not happening according to TCM tables

  1. #1

    2015 6L80e (Silverado 5.3L) Shifts not happening according to TCM tables

    So I'm not 100% if I missed something here or not. The reason I'm looking into this is every WOT besides 1-2 the transmission is basically shifting as fast as possible (0.075s).

    [ECM] 12050 - Fuel Cutoff RPM vs Gear: All set to 5900 RPM besides Neutral and Park @ 4000
    [TCM] 15020 - WOT Shift RPM vs Shift - Normal: All set to 5800
    [TCM] 15028 - Upshift Speed vs TPS vs. Shift - Normal:
    10 10 10 11 12 14 16 18 21 24 27 32 35 36 36 36 36
    15 15 15 17 20 23 26 30 35 40 46 51 55 58 59 59 59
    22 22 22 25 29 35 40 46 54 62 70 78 85 89 93 95 95


    [TCM] 15010 - WOT Shift Speed vs. Shift - Normal:
    1->2: 35
    2->3: 59
    3->4: 95
    2->1: 27
    3->2: 51
    4->3: 88

    VSS Tire Revs Per (both): 634.99mi

    1st gear shift WOT:
    5908 RPM @ 39 MPH - 350ms shift

    2nd gear shift WOT:
    5751 RPM @ 65 MPH - 75ms shift


    I can upload the files later on today if that helps.

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,533
    So what is the problem?

    It's not shifting at 75ms and not breaking parts?

    .2500 to .3500 is a good spot for shift times in a heavy truck unless you want issues down the road.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    I'm not sure how its shifting at the speeds it does because the 2-3 shift doesn't line up to any of the tables. The 75ms shift is really really fast, you can feel it and I'm guessing its not going to last if I keep it like that.


    Also I just realized I failed and put this in the V6 section and not the V8 section... any way a mod can move this?