8L90 8L90E Master Rebuild Kit w/ Raybestos GPZ Frictions

This is a master soft-parts rebuild kit for the GM 8L90 and 8L90E eight-speed automatic, the rear-drive Hydra-Matic that sits behind the 6.2L V8 (and 3.0L/3.6L V6) in 2016-2018 GM trucks, SUVs, and cars. It fits the Chevy Silverado 1500 6.2L, Camaro, and Corvette; the GMC Sierra and Yukon/Yukon XL; and the Cadillac Escalade, ATS-V, CTS-V, and CT6. Manufacturer part number dkkp33900hx.

The kit pairs a Raybestos GPZ high-energy friction clutch pack (ADP-RGPZ-019) with the Precision 901-series overhaul gasket and seal set (KP33900HX), so every friction, lip seal, sealing ring, O-ring, and gasket that comes out of the case goes back in new. The GPZ linings are built to take the heat the 8L90 makes without glazing, which is what keeps a rebuild from coming back with the same slip it went in with.

The 8L90 earned a name early for harsh or bumpy 1-2 and 2-3 shifts, torque converter shudder, and clutch material shedding that plugs the valve body and sets shift-quality codes. Once the frictions are worn there is no flush that brings them back. On the bench you tear the unit down, replace the friction pack and every seal in this kit, service the valve body and TCC separately, and reassemble to spec so shift feel and clutch capacity come back to new.

This is a soft-parts master kit: frictions, seals, and gaskets. It does not include steel plates, bushings, or the torque converter, so add those as your teardown calls for. Ships from the USA; handling in 1-2 business days.