10L90 Overhaul Kit 2017-2022, new and ready to install. Fits the 10L90. Ships fast from the USA.
If you are rebuilding the 10L90 out of a Camaro ZL1 or another high-output GM 10-speed from 2017 through 2022, this is the sealing kit the job starts with. It is a Precision International overhaul kit, part number KP33900PX, built for the GM 10L80 and 10L90 of those years. Buyers usually land here after a unit started slipping under load, flaring between gears, engaging late on cold mornings, or weeping fluid from the case and pan. The kit is supplied without molded pistons, which matters when you plan the parts list, so read the install notes before you order.
The 10L90 is the heavier-duty sibling of the 10L80, rated for the torque of supercharged and large V8 applications, but the hydraulic idea is the same. Six clutches are applied in combinations of four parts at a time to make ten forward gears, and the valve body sends pressure to each clutch piston through drilled shafts, rotating sealing rings, lip seals and case gaskets. Every one of those seals has to hold while the shafts spin at engine speed and the fluid runs hot. When a ring or gasket loses its seal, apply pressure leaks away, the clutch takes longer to fill, and the TCM has to stretch its adaptive values to cover the lost time. A gasket and seal kit restores those sealing surfaces in one purchase, so a unit that is already apart goes back together tight.
Not every 10L90 shift complaint means seals. Valve body bore wear and sticking solenoids cause many of the same symptoms, and on 2019-and-later units GM issued a safety recall over valve body wear that can move valves unexpectedly. Work through the 10L80 and 10L90 valve body testing guide and the pressure control solenoid guide first. If the clutches are burnt, the drums fail an air check, or you are already in the unit for a 3-4 clutch failure, the seals come out regardless and this kit is the right buy.
KP33900PX is listed for GM 10L80 and 10L90 transmissions from 2017 through 2022. That span crosses GM's change from Generation 1 to Generation 2 valve bodies around late 2019, and some units add shift-by-wire or auto start-stop hardware. The core seal set is shared, but the safest move is to scan the RPO label on the driver door B-pillar to identify your exact unit, or send us your year and VIN and we will confirm the match before it ships. For a newer unit, compare the 10L90 overhaul kit for 2018-2024. Hard parts, solenoids and tools for both 10-speeds are on the 10L80 and 10L90 parts page.
| Fits | 10L90 2017-2022 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes, the kit is listed for both GM 10-speeds from 2017 through 2022. Confirm your unit from the RPO label or send us your VIN if your transmission was built after the late-2019 Generation 2 change.
No. It is a gasket, ring and seal kit without molded pistons. Order frictions, steels, pistons and a filter separately if your unit needs them.
Only if pressure is leaking past rings or seals. Rule out valve body wear and solenoid faults first, and expect to replace frictions if the fluid smells burnt.
Dexron ULV only. Older Dexron fluids are thicker and cause shift complaints and early wear in these 10-speeds. Check the level hot using GM's procedure.
Yes. Clear the stored adaptive values and run the GM transmission fast learn, or the TCM will keep shifting on the old clutch fill data.
