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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.

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Old 08-02-2006, 02:15 AM   #1 (permalink)
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4L80E unusual slippage?

Here is a link to the last thread I started on this.
I'm in need of some help with this subject still. The slippage has no real repeatable pattern to it and will come and go as it pleases. I've connected to a tech1 and could not get it to slip more than 17 RPM's, and locked the torque converter in with the tech1 and lugged it down to about 1300 RPM's without any slippage. Things had been fine for 2 months and it started doing it again, so I parked it and not it won't slip again. Does it sound like I got to aggressive with the optic bump(5MM @idle) and putting to much power to it down low, or is this a 4L80E dying? The slippage seems to occur most when the conditions are ideal for peak performance, during winter it would slip alot but during summer it slips very sporadically. Tranny temps run around 160-180F in it since this problem started(used to run about 140-170, but my guage could have been off as well since I installed a noise filter in the power line since last summer).

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Old 08-03-2006, 06:59 AM   #2 (permalink)
Join Date: Jun 2006
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I'm a newby to autotransmissions but I've been reading these posts for a while and I learned two things: 1) before changing solenoids, have transmission aggressively flushed with fresh fluid and get the filter changed, and 2) not many gurus post here. Add mileage info & post on the 6.5L forum and get some of the top-shelf guys' input. Even if the moderator moves you back here, at least you'll get the sharp-wrenches' attention.

'93 GM 6.5L turbo & 4L80E, all hung backwards by Spartan Chassis and slipped under 31' Class A Gulfstream (pusher.) Remarkably like C/K 3500 but Dana axles, 10K#s rear, 6K steer, Bendix disc brakes x4 & Accuride 19.5" wheels. 81,000 miles. 10 1/4 mpg!
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