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Thread: 6l80 Cruising downshift issue

  1. #1
    Potential Tuner
    Join Date
    Jun 2013
    Posts
    5

    6l80 Cruising downshift issue

    Hi,
    After lots if reading and testing i need help from someone. Have a L98 and 6L80 swapped in to a SWB Patrol. The big issue we seem to be having is at cruise speed of 50KM or 60KM (main to speed limits around town) the trans is commanding a CT Downshift even with slight throttle to maintain speed or even with speed increasing. so as cruising along will shift from 5-4 then few seconds later 4-5 and will keep repeating the process.

    I have tried modified Virtual torque tables, shift speeds, used BC trans tool. Maybe i am missing something. any one please help?
    Engine has small camshaft
    Attached tune file and some logs.

    Thanks

    Matt
    Attached Files Attached Files
    Last edited by harro89; 09-19-2020 at 07:25 PM.

  2. #2
    Senior Tuner Russ K's Avatar
    Join Date
    Dec 2005
    Location
    Regina, Sask.
    Posts
    4,213
    Try logging Shift Mode to see which shift tables are in use. Is the scanner speed matching a GPS?

    Russ Kemp

  3. #3
    Potential Tuner
    Join Date
    Jun 2013
    Posts
    5
    Thanks Russ, i will check both of the suggestions.