GM 6L80 Transmission Information Thread

CTX-SLPR · Tuesday at 10:25 AM

From Sonnax:

That ball being missing very well could have played a factor in your symptoms. It is in the 1st gear circuit and was added to fix downshift complaints and engagement issues.

Those are pretty much my exact complaints so that's a good sign that I'm on the right track.

CTX-SLPR · Wednesday at 10:39 PM

So far so good, other than a brief scare when I hit the Trans Fast Learn button in HPTuners and I lost all gears things seem really good. I restored operation by just reflashing the TCU with the tune and the test drive was totally normal. Only thing I noticed was it felt a little soft going into top gear accelerating away from a light a moderate throttle but I don’t really remember how that was before.

Tomorrow I’ll go for a much longer drive to get the temp up to at least the 180’s and see if the 1st gear “overrun” on decel or delayed engagement pulling away come back.

GM 6L80 Transmission Information Thread

CTX-SLPR

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CTX-SLPR

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