10L80 Overhaul Kit 2017, new and ready to install. Fits the 10L80. Ships fast from the USA.
This is the more complete way to rebuild a GM 10L80 that has burnt its clutches. It is a banner-style kit listed for 10L80 units from the 2017 model year on, combining a Transtec overhaul gasket and seal set, a set of molded pistons, and BorgWarner friction plates, under part number 35955KIT with interchange DK16400CPS. The people who need it have a Silverado, Sierra, Tahoe, Suburban, Yukon or Escalade that flares between gears, slips once the fluid is hot, or came back with dark fluid and friction material in the pan. Instead of ordering seals, pistons and frictions from three places, the main wear items arrive in one box.
The 10L80 makes ten forward speeds with four planetary gearsets and six clutches, four of them applied in every gear. Each clutch has a bonded rubber piston that pressure pushes against a stack of frictions and steels, and the fluid reaches it through rotating sealing rings and the gaskets between the case, pump and valve body. When the unit overheats or runs high mileage, three things fail together: the friction lining glazes or burns, the piston lips harden, and the rings stop sealing. Replacing only one of the three tends to bring the truck back in a few thousand miles. This kit addresses all three, with the seals and gaskets from the overhaul set, new pistons so you are not trusting cooked rubber, and new BorgWarner frictions for the clutch packs.
Pull the pan before ordering. Clean fluid with no debris usually means the trouble is hydraulic or electrical, and the 10L80 valve body guide and the 10L80 pump failure guide walk through those checks. Dark fluid with clutch material means a rebuild is due, and the 10L80 3-4 clutch failure guide explains the most common pack to go first on these trucks.
The kit is listed for 10L80 transmissions from 2017 forward, and it was built around the original Generation 1 unit that launched that year. GM introduced Generation 2 units around late 2019 with changes to the valve body and clutch regulation, and shift-by-wire and auto start-stop trucks carry their own hardware. If your truck is a 2020 or later build, scan the RPO QR label on the driver door B-pillar, or send us your year and VIN so we can confirm the kit before it ships. If you only need gaskets and seals, the 10L80 overhaul kit for 2017-2022 costs less. The full range of 10-speed parts is on the 10L80 and 10L90 parts page.
| Fits | 10L80 2017 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | BorgWarner |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
A Transtec overhaul gasket and seal set, molded pistons, and BorgWarner frictions, sold as 35955KIT. Steel plates are not listed as included, so plan to inspect and reuse or replace your steels.
It is listed for 2017-on 10L80 units, but 2020 and later trucks are often Generation 2. Send us your VIN or scan the door pillar RPO label before ordering.
If the frictions are burnt or the fluid is full of debris, you need frictions and should replace pistons too, so this kit fits. If the clutches look good and you are only fixing leaks, a seal kit is enough.
Dexron ULV only. GM lists about 8.1 quarts for a 10L80 service fill, and a dry rebuilt unit takes more, so set the level hot by the factory procedure.
Yes. New frictions change the clutch fill timing. Clear the adaptive values and run the GM fast learn with a scan tool, then drive it gently while it adapts.
