4L60E / 4L65E Overhaul Kit with Gaskets, Seals, and Clutch Piston Lip Seals (1993-2003)

When you tear a 4L60E or 4L65E down, the one thing you do not want to do is reuse the old rubber. The lip seals harden, the O-rings take a set, and the pan and valve body gaskets never seal the same twice. This overhaul kit is the soft-parts package that gets the unit back together leak-free: it covers the case and pump gaskets, the metal-clad lip seals, the sealing rings, and the full run of O-rings and square-cut seals that live in the drums, servos, and valve body, plus the clutch piston lip seals that actually make the clutches hold pressure.

This is the KP33900EF overhaul kit for the 1993 through 2003 4L60E and 4L65E families, the units you find behind the small block in Silverados, Tahoes, Suburbans, S10s, Camaros, and the rest of the GM rear-drive lineup. It also crosses over to some Isuzu applications that ran the same transmission. It is a reseal and overhaul kit, not a clutch-and-steel master kit, so it is exactly what you want when the frictions and steels are still good and you are chasing a leak, freshening a good used unit, or resealing after a valve body or servo job.

Fitment on the 4L60E changed across the years, so match your year, make, model, and engine before you order. Lay the kit out on a clean bench, work off the exploded view, and you replace every piece of rubber in the transmission in one shot instead of ordering seals one at a time halfway through the build.