Ashley P Posted May 9, 2022 Share Posted May 9, 2022 I've had a rash of those transmissions with problems. Found a couple vids for info. Gonna spend a few hours to see if I can diagnose/repair these things before they burn up clutches. 1 Quote Link to comment Share on other sites More sharing options...
JohnC Posted May 10, 2022 Share Posted May 10, 2022 Yep! For high HP cars, the tune has to be spot on or they die fast. If the TEHCM is bad, i.e., hesitating, slamming gears, or like mine and the TC solenoid locked the converter, it'll break the 6L's quick as well. Quote Link to comment Share on other sites More sharing options...
JohnC Posted May 19, 2022 Share Posted May 19, 2022 BTW, Sonnax Zip Kit is what I used when rebuilding the 6L90. Also, new GM TEHCM, etc. Quote Link to comment Share on other sites More sharing options...
Ashley P Posted May 19, 2022 Author Share Posted May 19, 2022 My brother and I are kinda combining forces on this issue. Yesterday he put in a new Trans Go TCC valve and Sonnax seal kit in a 6l80. Said performance was good afterward. Sonnax does have lots of "fixes" for 6L80/90s, mostly in the valve body. 1 Quote Link to comment Share on other sites More sharing options...
Ashley P Posted May 19, 2022 Author Share Posted May 19, 2022 Oh, and I fixed the ATF temperature on a 8Lwhatever it was....by replacing the harness on the valve body. p0711 1 Quote Link to comment Share on other sites More sharing options...
JohnC Posted May 20, 2022 Share Posted May 20, 2022 My TQ Converter still feels like it's in lock-up. I never had that TC issue until I swapped to the CTSV 6L90. That said... I gave Tim King all the parts I had to rebuild everything! Hoping it doesn't do the same crap again and break because I'm so sick of trans problems! Swear I'll sale it and move on to a new ZL1. Quote Link to comment Share on other sites More sharing options...
JohnC Posted May 23, 2022 Share Posted May 23, 2022 On 5/19/2022 at 3:36 PM, Ashley P said: Oh, and I fixed the ATF temperature on a 8Lwhatever it was....by replacing the harness on the valve body. p0711 What did the harness have to do with over heating? Quote Link to comment Share on other sites More sharing options...
Ashley P Posted May 23, 2022 Author Share Posted May 23, 2022 (edited) Nothing, because there wasn't an overheating issue. The temp sensor was lying, changing too much and too fast. Edited May 23, 2022 by Ashley P Quote Link to comment Share on other sites More sharing options...
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