When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
so i built my 4l80e with hd clutches and a trango shift kit last year and its been great using a b&M ratchet shifter. however a couple months ago 4th gear started to slip at cruising speeds with the converter locked. so i ran through a couple things. noticing the shift cable for the b&m shifter had stretched and was applying some pressure against selector when in 4th towards neutral. so i adjusted it properly and no issues for a couple weeks. but then it started again so i tested the line pressures in gear all around 190-200 psi with reverse higher i dont recall the number but it was good so i chocked it up to the mishap with the shifter so i just tuned out 4th gear because it was October and was nearing the end of the season here in ny anyway so i put 2 more track days on the trans just not using 4th at all and it performed flawlessly for the 4 hours of track time i had between both days.
now to today i tore the trans open quick since i knew 4th gear clutches are right behind the pump for a quick swap out for good ones and i found clutches that really didnt look to me (at least compared to some 4l60e 3-4 clutches ive seen) and measured out to be the same thickness as the new clutches and steels. only one of the frictions had a center wear mark which was weird. other than that even the steals arein good shape. could these small issues be causing my issues? i never do wot pulls in 4th either because with my gearing it shifts to 4th at like 150mph. also its hooked to a cammed 5.3 that put 350whp and 350 torque to the ground so not a super power house but a good runner
1 of 2 frictions only one side damaged only heat mark on one steel other friction that had damage this is the vehicle btw
air check the 4th gear apply piston seals to about 40psi. you can do it on the bench, just make sure the clutch pack and pressure plate (and snap ring) are in place as the piston can overtravel without them in.
endplay is usually around .080 or .100 and ive not found a way to adjust it.
problems I look for are galled piston seal surfaces. if the piston ever cocked in the bore it'll chatter the hell out the sealing surfaces. since it's aluminum its pretty easy to mess it up
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
4l80e only 4th slipping 
