Master rebuild kit for the GM 6L80E and 6L90E six-speed in 2006-2022 Silverado, Tahoe, Suburban, Camaro, Corvette, Express and Savana.
Most 6L80s that come apart in a Silverado, Tahoe or Suburban did not fail from age. They failed from heat: a trailer on a long grade, a plow truck working all night, a converter that shuddered for months. The frictions glaze, the 3-5-R pack burns, and the truck loses 3rd, 5th and Reverse. This master rebuild kit covers the 6L80E and the heavy-duty 6L90E from 2006 through 2022 behind the 4.3L, 4.8L, 5.3L, 6.0L, 6.2L and 6.6L engines, and it cross-references to 24236931, 34664P, 195940, 135710D, 515709 and 195901XLS so you can match it against the kit your parts book calls for.
Five clutches do all the work in a 6L80. The 1-2-3-4, 3-5-Reverse and 4-5-6 clutches sit in the input housing and spin with it; the 2-6 and Low/Reverse clutches hold parts of the gearset to the case. Each gear uses two of them, so a single overheated pack takes out several gears at once. Once the case is open, the seals and gaskets that saw the same heat are hard and shrunk, and reusing them is how a fresh set of plates ends up slipping again. A master kit puts the soft parts for the whole overhaul in one box so the unit is renewed together.
Check the fluid and pull the pan first. Clean pink Dexron VI and a clean magnet usually means the problem is elsewhere, such as the input speed sensor or the TEHCM, which set codes like P0716 and P0751 and are not fixed by a rebuild. If pressure tests good but the truck slips, the packs are worn. Make sure you know which unit you have, too: Sonnax notes the 6L90 case is about 1-3/8 inch longer with a different output shaft and heavier internals, and the heavy-duty 2500HD, 3500HD and Express trucks are the ones most likely to carry it. Our 6L80 common problems and fixes guide covers the failure patterns, and the 6L80 pump failure symptoms guide covers the noise and low-pressure checks.
Listed vehicles: Silverado 1500 2008-2022, Silverado 2500HD/3500HD 2007-2022, Tahoe 2008-2020, Suburban 1500 2008-2020, Avalanche 2008-2013, Express 1500-4500 2009-2021, Savana 1500-4500 2009-2021, Camaro 2009-2015 and Corvette 2006-2018. GM changed internal parts over this span, and the 6L80 and 6L90 use different stack-ups, so compare the photos and your old plates with what is in the box before you start, and send us your year and VIN if you want us to check it. Drums, the pump and the valve body are not included. See the full 6L80 parts collection for hard parts.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The kit is listed for both the 6L80E and 6L90E, including 2007-2022 Silverado 2500HD/3500HD and Express and Savana 1500-4500. The 6L90 has a longer case and heavier internals, so compare your old plates with the new ones before assembly, or send us your VIN to check.
Those three gears share the 3-5-Reverse clutch. When it burns, usually from heat or a leaking apply circuit, all three are lost while 1st, 2nd, 4th and 6th still work. This kit replaces the plates and seals for that pack; also check the housing for cracks.
It is a soft-parts master kit. Drums, the pump and the valve body are separate. Check the product photos against your old parts before you start so you know exactly what you need to add.
Follow the severe-service schedule in your owner manual, not the normal one. In GM's 2015 Camaro manual, for example, normal service has no fluid change through 150,000 miles while severe service calls for fluid and filter at 45,000, 90,000 and 135,000 miles. Use Dexron VI only.
Yes. Reset the transmission adapts and run a fast learn with a capable scan tool so the controller relearns clutch fill times on the new frictions. Skipping this can leave harsh or soft shifts for the first several hundred miles.
