Master rebuild kit for GM 6L80E and 6L90E six-speeds with frictions, gasket and seal set, valve body gaskets and a new filter for 2006-up trucks.
A 6L80E that slips on the 3-4 shift in a Yukon, or loses its upper gears in an Express van that tows, has usually burned a clutch pack. This master kit covers the friction and sealing side of the overhaul for the GM 6L80E and 6L90E: a full set of friction plates, the overhaul gasket and seal set, the valve body separator plate gaskets and a replacement filter, packed in a box that ships at about 7 lb. It is a good fit for owners of the half-ton trucks, SUVs and vans who want every friction and seal renewed without paying for steels they may not need.
The 6L80E shifts entirely by clutches, with no bands. The TCM inside the TEHCM on the valve body times each shift by draining one clutch while filling the next. Fluid feeds those clutches through Teflon sealing rings on the shafts and is held by the piston seals, so a few thousandths of leakage across a ring or a hardened lip seal shows up as slow apply, flare and a TCM that keeps raising pressure to compensate. Renewing every friction and every seal at once is what returns apply times to where the factory calibration expects them.
The separator plate gaskets matter just as much. They sit between the valve body and the plate and direct oil to each solenoid circuit. A torn or compressed gasket can cross-feed circuits, so they should always be replaced when the valve body comes off.
Valve body wear can mimic worn clutches on these units. Sonnax notes that a worn actuator feed limit valve bore causes erratic solenoid supply pressure, with harsh shifts, soft shifts, wrong-gear starts and clutch failure as results. Gears Magazine recommends comparing mainline pressure at the case port with the EPC value the TCM is commanding before condemning the hard parts. If pressure is right and a gear still slips, the clutches are worn. Our 6L80 Escalade shift problems guide walks through those tests gear by gear, and 6L80 pump failure symptoms covers low pressure that starts at the pump.
The kit is listed for the 6L80E and 6L90E from 2006 up. Applications named on the listing include the 2007-2017 Cadillac Escalade 6.2L, 2009-2016 Silverado 1500 4.3L, 2015-2017 Suburban 6.0L, 2009-2014 Express and Savana 1500 4.3L and the 2007-2016 Yukon 6.2L, along with Sierra, Tahoe, Camaro SS and Hummer H2 models that use the same six-speed. Confirm your transmission by the RPO code on the vehicle label (MYC or MYD), and if your truck was built near a model-year change, send us the year and VIN so we can check it before it ships. All of our 6L80 parts are on the 6L80 transmission page.
| Fits | GM 6L80E and 6L90E, 2006-up |
| Includes | Friction plates, overhaul gasket and seal set, valve body gaskets, filter |
| Shipping weight | about 7 lb |
| Condition | New |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
If it has the 6L80E six-speed (RPO MYC), the soft parts in this kit are the same. The listing names many 2006-up GM trucks, SUVs and vans. Send us the year and VIN if you want fitment checked before it ships.
No. The kit has frictions, the overhaul gasket and seal set, valve body separator gaskets and a filter. Inspect your steels and converter separately.
Resealing them is cheap insurance while the valve body is out, because leaking pressure switches cause false clutch codes. A switch kit is sold separately.
Compare mainline pressure to the commanded EPC value with a gauge and scan tool. If pressure is correct and a gear still slips, the clutch pack is worn. If pressure is erratic, look at the valve body and pump first.
Dexron VI. Total capacity varies by vehicle and cooler setup, so fill to the check plug at operating temperature rather than by a fixed number of quarts.
