GM 6L80E/6L90E master overhaul kit — steel clutch plates, clutch-pack sealing rings, lip seals and gaskets for 2006-2014 Silverado, Tahoe and Escalade.
This master kit is aimed at the 2006-2014 window of the GM 6L80E and 6L90E, the years when these six-speeds went behind most LS-powered Tahoes, Silverados, Sierras, Escalades, Suburbans, Avalanches, Corvettes and Camaros. If your truck shudders, bangs into gear, flares between shifts or loses line pressure as it warms up, and the teardown is already on your calendar, this box covers the steel clutch plates, every clutch-pack sealing ring, the piston lip seals and the pan and valve body gaskets in one order.
In the 6L80E the clutches are applied by oil, not by springs, and that oil has to get from the valve body to each piston without bleeding off along the way. It passes through separator plate gaskets, then across rotating sealing rings on the input shaft and drums, then behind lip seals on the pistons. As those rings and seals wear, apply pressure leaks into the neighboring circuit. The clutch then comes on slowly or not at all, and the computer reads the delay as slip. New sealing rings and lip seals restore the tight oil paths, and new steels give the clutch packs a flat, true surface to clamp against.
Leaking sealing rings and drum circuits show up on an air check. With the unit apart, the 3-5-R and 1-2-3-4 drum circuits can be air tested to find the exact leak instead of guessing, and a 6L80/6L90 drum leak tester makes that test repeatable. Before pulling the transmission, compare commanded and actual line pressure, because a weak pump gives the same delayed engagement. Our 6L80 pump failure guide covers that check, and the 6L80 Escalade shift problems guide walks through harsh and delayed shift diagnosis on the heavier SUVs.
The listing covers 6L80, 6L80E, 6L90 and 6L90E rear-wheel-drive units from 2006 through 2014, including the 2006-2011 Escalade and STS, 2010-2014 Camaro, 2006-2014 Corvette and Tahoe, 2008-2013 Avalanche, 2009-2014 Suburban 1500 and Yukon, and 2008 Sierra. Hummer H2 and H3 models are also listed, but early H2s used a four-speed and most H3s never had this transmission, so check the RPO code before ordering: MYC is a 6L80 and MYD is a 6L90. This kit does not fit the front-drive 6T70 or 6T75, which share nothing with the 6L80 despite the similar name. The product photo also shows a pan filter and friction plates, so compare it with what your teardown needs. If you are unsure, send us the year and VIN. The full range for this transmission is on our 6L80 parts collection.
Replace every sealing ring and piston lip seal, even the ones that look fine, because a single leaking ring can undo the whole rebuild. Lube lip seals with assembly gel or clean Dexron VI so they do not roll during piston installation. Stack the new steels into each drum with the frictions you are using, then set the clearance for each pack to the factory figure. Check the case, pump and drum bushings and replace any that are worn; the 6L80 bushing driver tool set fits those bores. After the rebuild, air check each drum circuit with the input drum air check tester before the case is closed. Fill with Dexron VI, check the level at the case check plug at operating temperature, and reset the adapts with a scan tool before the first drive.
| Transmission | GM 6L80 / 6L80E / 6L90 / 6L90E (2006-2014) |
| Kit type | Master overhaul (steel clutch plates, sealing rings, seals, gaskets) |
| Fits | Escalade, Silverado/Sierra 1500, Tahoe, Yukon, Suburban, Avalanche, Camaro, Corvette, Hummer H2/H3 |
| Item weight | 15.19 lb |
| Package size | 14.57 x 12.28 x 10.28 in |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The listing covers 2006-2014 units in the Escalade, STS, Camaro, Corvette, Tahoe, Avalanche, Suburban 1500, Yukon and Sierra. Confirm the RPO code on the vehicle, MYC for 6L80 or MYD for 6L90, before ordering.
No. The 6T70 and 6T75 are transverse front-drive transmissions and do not share clutch plates, seals or gaskets with the rear-drive 6L80 and 6L90.
If your frictions are glazed, burnt or thin, yes. Running new steels against worn frictions shortens the life of the rebuild. The product photo shows friction plates as well, so compare it with the packs you take apart.
They can. Reverse uses the 3-5-R clutch, which is fed through rotating sealing rings. A leaking ring lets apply pressure bleed off, and an air check on the 3-5-R drum circuit will show it.
Dexron VI only. Most 6L80 applications have no dipstick, so the level is set at the case check plug with the fluid at operating temperature.
