4L60E Master Rebuild Kit with Clutches and Steels

This is a master-level overhaul kit for the GM 4L60E and 4L60-E, covering 1994 and up applications in rear-wheel-drive Chevrolet, GMC, Cadillac and Pontiac trucks and SUVs. Master means it goes past a plain gasket-and-seal set: you get the friction plates and steel plates for the clutch packs along with the pan gasket, case seals, o-rings and sealing rings, so a teardown does not stall halfway because one part was not in the box.

On the bench the order is the usual 4L60E sequence. Pull the pan and valve body, strip the pump, drums and reaction shell, then soak the new frictions in clean Dexron VI for at least fifteen minutes before they go in. Stack each clutch pack in the factory order, set clearance with a dial indicator, and replace every sealing ring the kit supplies while the drums are apart. Reseal the pump body and install the new case o-rings before the unit goes back together.

The failures this kit answers are the ones every 4L60E eventually runs: a slipping or burnt 3-4 clutch pack, delayed or flared 1-2 and 2-3 shifts, and fluid leaking past hard, shrunken case seals and pump o-rings. If the unit is already apart for a sun shell or pump, reline it now rather than reassembling worn frictions behind a new hard part. This kit does not include a torque converter, steel drums or the sun shell, so order those separately if your teardown shows they are damaged.