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Thread: Got a question on 6L80E

  1. #1

    Got a question on 6L80E

    I have a Jeep jk with 4.10:1 gears and 35" tires running a 6.0 ls with 6L80E trans. On interstate running 78 mph and 2100 rpm's, with a head wind going up an overpass it will drop down a gear, out of 6th into 5th. Is there anyway of adjusting the drop down point? I would think it should hold that gear longer but maybe not.

    I have been messing with downshift max speed to try and control when it downshifts but not having any luck. it was set at 84, i
    I have reduced it to 73 and it still kicks down.

    Looking for some guidance.

    Here is the tune. It is from a 2011 Denali 6.2 so may look a bit different than a 6.0
    Attached Files Attached Files

  2. #2
    Advanced Tuner
    Join Date
    Oct 2013
    Posts
    550
    You are adjusting the wrong parameter for your issue.

    Go to Transmission>Auto Shift Speeds>Part Throttle Shift … then all of the tabs for 6th gear.

    In the Normal pattern, a downshift from 6th gear to 5th gear around 80 MPH would roughly correspond to about a 65% to 70% throttle opening.

    To hold 6th gear longer, increase the downshift speeds in the appropriate cells. Remember that the corresponding upshift speed must always be greater than the downshift speed – or you will have a schizophrenic 6L80 on your hands.

  3. #3
    Thanks, I'll give that a try. Yeah I remember reading about the upshift and downshift states.