Slides over the 4L60E reverse input housing hub so the piston inner lip seal goes on without rolling or cutting. Also fits 700R4, 4L60 and 4L65E.
If you are rebuilding a 4L60E out of a Silverado, Tahoe, S10 or Camaro and the old unit came in with no reverse, a delayed reverse engagement or a burned reverse input pack, the piston seals in that drum are one of the first places the problem started. This machined aluminum sleeve slides over the reverse input clutch housing hub so the new inner lip seal on the piston rides over the snap ring groove and the sharp hub edges instead of catching on them. It fits the GM 700R4, 4L60, 4L60E and 4L65E reverse input housing, and it goes back in the drawer for the next one.
The reverse input clutch is the drum that sits right behind the pump. When you pull the shifter into reverse, line pressure is fed into that drum and pushes the reverse input piston against the clutch pack. The piston carries an inner and an outer lip seal, and both have to hold apply oil for the clutch to lock. In the GM overhaul procedure the inner and outer seals go on the piston first, then the factory J 44571-1 reverse input clutch piston installer is fitted over the housing, the piston is pushed home, and the installer comes back off before the return spring goes in. This sleeve does the inner half of that job: it covers the hub so the inner lip cannot fold over or get shaved.
A broken reverse shell or stripped sun shell splines will also kill reverse on this unit, so do not assume the seal is the cause until you have looked at the hard parts.
With the drum on the bench and the piston installed, put air to the apply hole and listen. A good piston strokes with a solid thump and holds; a hiss from the inner bore means the inner lip is rolled or cut. Our guide to 4L60E common problems and what to do about them walks through how reverse failures differ from 3-4 clutch failures, and the bench tools you actually need for a 4L60E rebuild covers air checking every drum before final assembly.
The listing covers the reverse input clutch housing in the GM 700R4, 4L60, 4L60E and 4L65E. That spans the 4L60E years in 1993-2013 Chevrolet Silverado 1500, Tahoe, Suburban, S10, Blazer, Camaro and Corvette and the GMC Sierra 1500, Yukon and Sonoma, plus the earlier 700R4 cars and trucks. GM revised reverse input housings over the years, so compare the hub on your drum to the sleeve before you lube anything up. If you are unsure which drum you have, send us your year and VIN, or browse the full 4L60E parts and tools collection.
New pistons and seals normally come in the kit you are installing. The 4L60E full overhaul rebuild kit for 2004-up units covers the soft parts, and if you are still outfitting the bench, the 7-piece 4L60E rebuild tool kit handles the other drums.
| Fits | GM 700R4, 4L60, 4L60E, 4L65E reverse input clutch housing |
| Material | Machined aluminum |
| Shipping weight | About 5.3 oz |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for the reverse input clutch housing in the GM 700R4, 4L60, 4L60E and 4L65E. Compare the hub on your drum to the sleeve before use, since GM revised housings over the production run.
No. This sleeve covers the hub for the inner lip seal. The outer lip seal goes into the drum bore and should be worked in carefully with a feeler-style seal tool or a lubricated plastic pick, never a screwdriver.
People do, but tape can leave residue and a feeler gauge only covers part of the hub. A full sleeve keeps the whole inner lip off the snap ring groove, which is where most rolled seals happen.
Use ATF or a transmission assembly lube. Dexron VI is the current GM fill for the 4L60E. Do not use chassis grease, which does not dissolve and can block passages.
No. A broken reverse shell, stripped sun shell splines or a burned low and reverse band or clutch can also cause it. Air check the reverse input drum first so you know whether the seal is holding.
