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Thread: 6L80 won't shift out of 6th on highway

  1. #1
    Tuner in Training
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    Dec 2020
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    23

    6L80 won't shift out of 6th on highway

    Hey everybody,

    2010 Silverado, 6.2, 6l80, turbo, 3200 stall.

    The truck drives around town without much issue and I'm relatively happy with the tune. However, on the interstate, the truck won't shift out of 6th. I can see that it's pulling timing as I roll into the throttle but it won't shift out of 6th. I've looked through my trans tune but I'm not seeing anything that would keep it from downshifting. Any help would be greatly appreciated. Thanks!

    Rebuilt 6L80 3200 Stall_Rev. 6.hpt
    newesthighwaywot.hpl

  2. #2
    Senior Tuner
    Join Date
    Jul 2020
    Location
    VIC Australia
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    Try these couple of things, you're hitting a torque limit

    ECM 2810 max out
    ECM 2811 max out

    TCM 5410 max out
    TCM 5411 max out - 1
    TCM 5420 max out

  3. #3
    Potential Tuner
    Join Date
    Mar 2021
    Posts
    9
    It wont shift out off 6th until the shift schedule is satisfied, that is the throttle position verse speed is below the blue line.
    Attached Images Attached Images

  4. #4
    Tuner in Training
    Join Date
    Dec 2020
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    23
    Quote Originally Posted by hjtrbo View Post
    Try these couple of things, you're hitting a torque limit

    ECM 2810 max out
    ECM 2811 max out

    TCM 5410 max out
    TCM 5411 max out - 1
    TCM 5420 max out
    This seems to have fixed the issue. Thanks for your help!

  5. #5
    Senior Tuner
    Join Date
    Jul 2020
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    VIC Australia
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    You're welcome!