Reseals and services the GM 6L80 and 6L90 six-speed automatic: filter, pan gasket, and the full gasket, seal, and O-ring set for a 2006-up overhaul.
A 6L80 or 6L90 that leaks at the pan, slips after it warms up, or takes a second to grab Drive on a cold morning usually needs new rubber and Teflon before it needs anything else. This master overhaul kit puts every gasket, seal, sealing ring and O-ring for the unit in one box, along with the internal filter and pan gasket, for the six-speed behind the V8 in 2006-and-up Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, Express and Savana vans, Camaro, Corvette, CTS-V, STS-V, G8 and Hummer H2.
The 6L80 has no bands and no one-way clutch doing the heavy lifting in most gears. Every shift is one clutch releasing while another applies, timed by pressure control solenoids in the valve body. That only works if each clutch circuit holds the pressure the TCM commands. Hardened piston lip seals, worn Teflon rings on the stator shaft and the input and output shafts, and tired case and pump gaskets all bleed pressure. The TCM sees the clutch take longer to apply, adapts, and eventually runs out of room, which is when you feel flares, slips and harsh catches. Replacing the seal set restores those circuits so the clutches and the adaptive learning have something solid to work with.
Leaks are easy to see. Pressure loss is not. Check fluid level with the GM hot check procedure, since there is no dipstick, then scan for codes and watch commanded versus actual pressure. A valve body or TEHCM fault (P0716, P0717, P0751) or a worn pump can look like a seal problem, so read our 6L80 pump failure symptoms guide and the 6L80 common problems guide before you commit to a teardown.
Listed for the 6L80, 6L80E, 6L90 and 6L90E, 2006 and up, and cross-referenced to 195901XLS, 195903XLS, KP33900JAX and KP33900JBX. The 6L90 is the longer, heavier-duty case used in 2500-series trucks, vans and supercharged cars, and this kit is listed for both. GM revised the 1-2-3-4 and 3-5-R pistons for 2008, so if your unit is a 2006 or 2007, or you are mixing parts from different years, send us the year and VIN and we will confirm before it ships. Everything else for the unit is in the 6L80 collection.
This is a reseal kit. It has no friction plates and no steel plates. If the clutches are burnt or the pack clearances are out, step up to the 6L80 master rebuild kit with steels, frictions and filter instead of buying plates separately.
| Fits | GM 6L80 / 6L80E / 6L90 / 6L90E, 2006-up |
| Kit level | Reseal/overhaul: filter, gaskets, seals, sealing rings, O-rings |
| Not included | Friction plates and steel plates (add clutch module separately) |
| Vehicle applications | Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, Express, Savana, Camaro, Corvette, CTS-V, H2 |
| OE cross-reference | 195901XLS, 195903XLS, KP33900JAX, KP33900JBX |
| Includes filter | Yes, internal transmission filter and pan gasket |
| Item weight | 7.5 lb |
| Ships | From the USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It includes the filter, pan gasket, gaskets, piston seals, sealing rings and O-rings. Friction and steel plates are not included; choose a master rebuild kit with frictions and steels if you need them.
It is listed for the 6L80, 6L80E, 6L90 and 6L90E from 2006 up. If you have a 2006 or 2007 unit or a mix of early and late parts, send us your year and VIN to confirm.
DEXRON VI. There is no dipstick, so set the level with the transmission at operating temperature using the check plug procedure in the service manual.
Yes. Reset the transmission adapts with a capable scan tool and drive the vehicle through the relearn so the TCM learns the new apply times.
If the slip comes from seal or sealing ring leakage, yes. If the frictions are burnt, a drum is cracked or the valve body is at fault, seals alone will not fix it, so diagnose first.
