Overhaul gaskets and seals, a full friction plate set and a new filter for rebuilding a GM 6L80 or 6L90 six-speed in trucks, SUVs, Camaro and Corvette.
If your 2006-2017 Silverado, Tahoe, Escalade, Camaro SS or Corvette is flaring between gears, slipping in reverse, or showing clutch ratio codes that a fluid change did not clear, the six-speed has usually worn through a clutch pack and needs to come apart. This kit is the soft-parts half of that overhaul for the 6L80 and 6L90: the full overhaul gasket and seal kit, a complete set of friction plates and a new filter. It interchanges with the common 24236931, 34664P, 195940, 135710D, 515709 and 195901XLS kit numbers, so it matches what most rebuild manuals and parts lists call out.
The 6L80 has five clutches: 1-2-3-4, 3-5-Reverse, 4-5-6, 2-6 and Low/Reverse. Every shift is clutch-to-clutch, meaning the TCM releases one pack while it applies another, and it relies on piston seals and sealing rings holding pressure so the timing comes out right. When frictions glaze or wear thin, apply volume grows, the TCM keeps adding pressure through its adapts, and eventually it runs out of correction. A kit like this resets every friction surface and every rubber seal at once so the controller is working with a known, tight transmission again.
Note what is not in the box: steel plates, pistons and bushings. That keeps the price down, but it means you have to judge the steels yourself. Reuse a steel only if it is flat on a surface plate and shows no blue heat marks or raised hot spots. If one pack burned, plan on new steels for that pack at minimum.
Several 6L80 complaints look like worn clutches and are not. On 2010-2015 Camaros, GM documented a cold 2-3 flare caused by air trapped in the 3-5-R circuit, fixed by a purge procedure instead of a rebuild. Worn actuator feed limit valve bores in the valve body also starve the solenoids and produce harsh shifts, soft shifts and clutch codes. Check mainline pressure against what the TCM is commanding before you pull the unit. Our 6L80 Corvette common problems and 6L80 Camaro common problems guides cover the car-specific traps, and 6L80 common problems and fixes covers the trucks.
This kit is listed for the 6L80 and 6L90 from 2006 through 2017: Silverado and Sierra 1500, 2500HD and 3500HD, Tahoe, Suburban, Yukon, Escalade, Avalanche, Express and Savana vans, Camaro, Corvette, CTS, STS, XLR, Pontiac G8 and Hummer H2. The 6L90 is a longer, heavier-duty case with a different output shaft, and plate counts in some packs changed between model years, so count the plates in each drum as you disassemble and compare them to the kit before you start installing. If you are unsure which unit you have, read the RPO code on the glovebox or door label (MYC is the 6L80, MYD the 6L90) or send us the year and VIN. You can see every 6L80 part we carry on the 6L80 transmission page.
| Includes | Overhaul kit (gaskets, metal clad seals, o-rings, sealing rings), friction plate kit, filter |
| Not included | Steel plates, pistons, bushings |
| Primary fit | GM 6L80 / 6L80E |
| Also fits | 6L90 / 6L90E |
| Years | 2006-2017 (confirm by vehicle) |
| Cross reference | 24236931, 34664P, 195940, 135710D, 515709, 195901XLS |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It includes the overhaul gasket and seal kit, a full friction set and a filter. Steels, pistons and bushings are not included. Reuse steels only if they are flat and unblued, or replace them separately.
It is listed for both the 6L80 and 6L90 from 2006 to 2017. Plate counts vary in some packs by year, so count the plates in each drum on teardown and compare them to the kit before assembly. Send us your year and VIN if you want us to check.
The 3-5-Reverse and 4-5-6 packs are the usual failures. A burned 3-5-R pack shows up as flare on the 2-3 shift and reverse slip, while a failed 4-5-6 pack takes out the upper gears together.
Dexron VI. Soak the new frictions in it before assembly, then fill and check the level at the case check plug at operating temperature, since the 6L80 has no dipstick.
Yes. Reset the transmission adapts and run a fast learn so the TCM relearns fill pressures on the new clutches. Skipping it can leave harsh or flaring shifts until the old adapt values age out.
