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The 4L60E is GM's electronically controlled rear-drive four-speed, introduced for 1993 and used for well over a decade in Silverado and Sierra half-tons, Tahoe, Yukon, Suburban, S10, Blazer, Camaro, Firebird and many vans. The heavier-duty 4L65E shares the same basic design and the same overhaul kits in most years.
An overhaul gasket and seal kit is the base of every 4L60E rebuild. It is also the right buy on its own when the clutches still measure good but the unit leaks, engages late, or slips on the 2-4 band because a hardened seal is bleeding off apply pressure.
What Is in the Box
A complete 4L60E overhaul kit replaces the rubber, paper and plastic that keep fluid where it belongs. The 1993-2003 kit we stock (KP33900EF) includes:
- Upper and lower valve body gaskets in both the 1993-2000 and 2001-up patterns
- Metal-clad front pump seal and pan gasket
- Pump bolt O-rings and pump screens
- Clutch piston lip seals for the clutch packs
- Teflon sealing rings for the pump stator shaft and drums
- 2-4 servo inner and outer O-rings and accumulator piston O-rings
- Case electrical connector O-ring and filter seal
- Valve body check balls
Not included: friction plates, steel plates, the 2-4 band, bushings, the filter, or solenoids. For a side-by-side of kit types, see rebuild kit vs master overhaul kit.
Overhaul vs Banner vs Master
| Kit Type | Contents | Buy It When |
|---|---|---|
| Overhaul (gasket and seal) | Gaskets, seals, O-rings, sealing rings | Fixing leaks, resealing a unit with good clutches, or buying clutches separately |
| Banner | Overhaul kit plus friction plates | Frictions are worn but the steels are flat and not heat-blued |
| Master | Overhaul kit plus frictions and steels, often a band and filter | High-mileage or overheated unit getting a full rebuild |
If you have not torn it down yet, wait. Blued or warped steels mean a master kit. A burned 3-4 pack, the most common 4L60E failure, usually means steels too. If you are only chasing leaks, the overhaul kit is the buy.
Fitment: The Valve Body Gasket Is the Year-Sensitive Part
Most of a 4L60E soft-parts kit carries over across years. The valve body gaskets do not. GM changed the spacer plate during production, and the gasket has to match the plate's holes exactly or an oil circuit gets blocked or cross-fed.
| Production Range | What to Know |
|---|---|
| 1993-2000 | Early spacer plate pattern. Covered by the 1993-2003 kit, which includes this gasket style. |
| 2001-2003 | Later spacer plate pattern. Also covered by the 1993-2003 kit, which ships both styles. |
| 2004-up | Later units with further running changes. Buy a kit listed for 2004-up rather than the 1993-2003 kit. |
When a kit ships two versions of a gasket, lay each one over your spacer plate and match every hole before installing. Then throw the unused one away so it never ends up in the next job.
The Leaks and Pressure Losses a Reseal Fixes
- Front pump seal. Fluid at the bottom of the bell housing. Check the converter hub and pump bushing too, or the new seal leaks again. Our 4L60E pump guide covers the bushing side.
- Case connector O-ring. Fluid wicking up the harness above the passenger side of the pan.
- Pan gasket. Easy to fix, easy to over-tighten. Torque the bolts evenly in a crisscross pattern.
- 2-4 servo O-rings. A leaking servo seal lets the band slip in 2nd and 4th. See the 4L60E servo guide.
- Teflon sealing rings. Worn rings bleed pressure from the drums, causing slow engagement and slipping when hot.
- Filter seal. The old seal often stays stuck in the case bore when the filter comes out. Pull it every time; a doubled seal or an air leak here starves the pump.
The pan, connector O-ring and output seal can be done in the truck. The pump seal, servo-to-drum seals and sealing rings mean the transmission comes out, so reseal everything while it is on the bench.
Buying Tips From the Bench
- Size the Teflon rings before installing the pump. A ring sizer tool squeezes them back down so the drum slides on without cutting a ring.
- Soak lip seals in ATF and use assembly lube that dissolves in ATF, not chassis grease.
- Put the check balls back where they came from. Photograph the valve body before you pull it apart.
- Drive the pump seal in square with a seal driver, not a socket and hammer at an angle.
- Add a filter. Overhaul kits do not include one. See the 4L60E filter and pan kit guide.
Shop the Part
We stock the 1993-2003 4L60E / 4L65E overhaul gasket and seal kit, plus pumps, servos, rebuild kits and tools. Free shipping on every order.
View 1993-2003 Kit → All 4L60E PartsNeed a complete rebuild kit or a hard-to-find hard part? Our sister store Core Transmission Parts carries the full lineup.
FAQ
Does a 4L60E overhaul kit include clutches?
No. An overhaul kit is gaskets, seals, O-rings and sealing rings. Frictions come in a banner kit, and frictions plus steels come in a master kit.
Does the 1993-2003 kit fit a 2001 4L60E?
Yes. The 1993-2003 kit carries valve body gaskets in both the 1993-2000 and 2001-up patterns. Match the gasket to your spacer plate before installing.
Will the 1993-2003 kit fit a 2005 4L60E?
Buy a kit listed for 2004-up instead. Later units had running changes, and the year-listed kit is the safe match.
Can I replace the 4L60E front pump seal without pulling the transmission?
No. The pump seal sits behind the torque converter, so the transmission has to come out. If it is coming out, reseal the whole unit.
What else should I buy with a 4L60E gasket and seal kit?
At minimum a new filter. If you are opening the unit, plan on bushings, a Teflon ring sizer, and a seal driver, and inspect the converter hub for wear.