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Chevy 4L80E Transmission Pressure setting

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Moderators: mikel, 06MonteSS


Posts: 3
I've just put the 87 Tune on my 02 Avalanche 2500. It has the 4L80E Transmission, it shifts a bit hard like I'm trying to chirp my tires. I went into custom settings and changed the partial throttle shift pressure down to lowest setting -25 and it didn't change anything. Am I doing something wrong? I'd like to soften the shift up just a little bit. Awful heavy truck and I don't want to break anything. The transmission had a full rebuild about a year ago.

thanks,
Bob


Posts: 53686
Location: DiabloSport World Headquarters

Im guessing it was rebuilt a bit better than stock to add some mechanical line pressure?
Maybe a shift kit? Valve body mod?
Mike Litsch
Powerteq Customer Service Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST


Posts: 3
No its a totally stock rebuild, the original transmission I had to drive 500 miles pouring in transmission fluid as fast as it squirted out to get it home to fix the leak. It lasted about 6 months before it quit, that when i had it rebuilt. With the stock tune you cant feel it shifting at all, really smooth.


Posts: 4
I'm in a similar position with the shifting, except no rebuild, still original trans (I believe) and 91 octane. I tried playing with the shift time with little success. It's my daily and I don't want to have to do a rebuild if I don't need to. 220k miles...
Although, when I do give it everything, that quick, hard shift is beautiful.
2002 avalanche 2500 8.1L cold air intake, cat back exhaust, I3 tuner, 31.5"general grabbers, 17" XD wheels


Posts: 3
Same here, I paid a lot for the nice transmission rebuild, not worth it for the chirping of the big tires, haha.


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