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Thread: 4L80E WOT shifting problem. 1st-2nd bounce rev limiter!

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  1. #1
    Junior Member
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    Mar 2010
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    Default 4L80E WOT shifting problem. 1st-2nd bounce rev limiter!

    I'm not sure if there is something wrong with the tune or my intermediate clutches are starting to fail... Problem is the 1st-2nd gear shift is not happening soon enough and engine is bouncing off rev limiter. I have posted a log and a screenshot showing that the "GM.GEAR" PID is not switching to 2nd gear until around 63mph or 7440 rpm. The tune I posted shows the 1st-2nd WOT shift commanded at 6200rpm and the part throttle shift should happen at 50mph. Also if you notice 2nd-3rd gear is off from the tune as well. WOT=7000rpm and it is actually shifting around 6465rpm.

    Does the GM.Gear PID represent when the gear is commanded to shift or does it represented what the pressure switch sees in the trans?

    Thanks!

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