6L80E and 6L90E master rebuild kit with friction plates, seals, gaskets, separator plate gaskets and filter for 2006-2022 GM trucks and vans.
This is the kit for a 6L80E or 6L90E that has worked hard: a 2500HD gas truck pulling a trailer, a Savana work van, or a Yukon XL that has been slipping in fourth and fifth. It covers the whole 2006-2022 run of GM's rear-wheel-drive six-speed and goes further than a basic overhaul set, because it includes bonded pistons along with the frictions, lip seals, sealing rings, O-rings, pan and case gaskets, valve body separator plate gaskets, a rear seal and a new pan filter. It interchanges with the 195901XLS, 24236931, 34664P, 195940 and 135710D kit numbers.
Each of the five clutch packs is applied by a piston that has to seal against its drum or housing. On a high-mileage or overheated unit the rubber on those pistons takes a set and starts leaking apply oil, so the pack engages slowly even with good frictions. Because this kit carries bonded pistons, you replace the sealing surface as a complete part instead of fitting loose seals onto old pistons. Paired with new frictions and fresh sealing rings, every clutch gets back its full holding pressure, which is what a towing truck needs.
The 6L90E version in the HD trucks uses a longer case, a different output shaft and heavier internals than the 6L80E, but the same five-clutch layout and the same overhaul approach.
Rule out pressure and control problems first. A line pressure gauge read against the TCM's commanded value tells you whether the hydraulics are healthy, and a harsh downshift on its own may only need the adapt reset GM prescribes in PI1343B. Low pressure that starts at the pump is covered in our 6L80 pump failure symptoms guide, and the full list of what fails on these units is in 6L80 common problems and fixes.
Listed applications: 2006-2020 GMC Yukon and Yukon XL, 2007-2022 Silverado and Sierra 2500HD and 3500HD with the 6.0L and 6.6L gas engines, 2009-2021 Express and Savana vans, 2006-2018 Cadillac Escalade, 2008-2015 CTS-V and 2006-2009 STS-V. Duramax diesel trucks use an Allison transmission, not this one, so the kit does not apply to them. Check the RPO code on the vehicle label (MYC for the 6L80E, MYD for the 6L90E) and count your plates on teardown, since pack counts vary by year and model. If you are unsure, send us the year and VIN. Browse the rest of the range on the 6L80 transmission page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. Duramax diesel trucks use an Allison transmission. The kit fits the 6L80E and 6L90E behind the 6.0L and 6.6L gas engines in 2007-2022 HD trucks, along with the other listed GM applications.
The seal is molded onto the piston, so you replace the whole sealing surface instead of stretching new rubber onto an old piston. That is useful on high-mileage or overheated units where the old pistons may be distorted.
No. The kit has frictions, bonded pistons, seals, sealing rings, gaskets, separator plate gaskets, a rear seal and a filter. Steels must be reused if within spec or bought separately.
No. Use an ATSG manual or GM service information for clutch clearances, torque values and the correct assembly order.
Flush the cooler and lines, fill with Dexron VI to the check plug at operating temperature, reset adapts and run a fast learn, then drive unloaded for a while so the TCM can finish learning before you hook up a trailer.
