4T60E Overhaul Kit 1991-1999, new and ready to install. Fits the 4T60E. Ships fast from the USA.
This overhaul kit is built for the GM 4T60E made from 1991 through 1999, the electronic front-drive four-speed that sat behind V6 engines in Buick, Chevrolet, Oldsmobile and Pontiac cars before GM replaced it with the 4T65E. The listing is specific on that point: it is for the 4T60E version and not the 4T65E. It is a soft parts kit, carrying the gaskets, seals, O-rings, sealing rings and small rubber pieces needed to reseal the transaxle during a rebuild, and it is catalogued under the 84002E reference (manufacturer number T84002EX). Most people searching for it have a car that leaves spots on the driveway, goes into gear slowly after a cold night, or is already apart on the bench for a clutch or band repair.
Every clutch and band in the 4T60E is applied by pump pressure routed through the valve body and channel plate into a piston. The rubber in this kit is what keeps that oil where it belongs: lip seals on the pistons, sealing rings on the rotating drums and shafts, O-rings on the fittings and solenoids, and the pan and cover gaskets that keep the fluid in the case. By now an original 4T60E has rubber that is twenty-five to thirty-five years old. It shrinks, takes a set and goes hard, and a hard lip seal lets apply oil bleed past the piston. The result is a clutch or band that engages late and slips under load even though the friction material may still be serviceable. This kit does not include frictions, steels, bands or a filter, so treat it as the sealing half of the rebuild.
Start with the easy checks. Clean the case, drive the car, and find the highest wet spot; a pan or side cover leak on a car that still shifts well may not justify a full teardown. For engagement and slip complaints, check the fluid level and smell, then drop the pan and look at the magnet. Clutch lining or metal means this kit alone will not be enough. Do not overlook the hydraulics: Sonnax lists worn boost valves and pressure regulator bores in the 4T60-E valve body that cause soft shifts and clutch distress that look like worn seals. Our delayed engagement guide walks through the cold-engagement checks, and the 4T65E diagnosis guide covers the family weak spots this older design shares.
The listing fits the 4T60E from 1991 through 1999 in GM front-drive cars. Because GM moved several of the same nameplates to the 4T65E starting in 1997, a late-1990s Buick or Pontiac can have either transaxle, and a 4T65E kit will not fit a 4T60E or the other way around. Read the ID tag on the case before you order, and if you are unsure, send us your year and VIN and we will check it. GM also made running changes inside the 4T60E, including a revised TCC regulator valve from 1993 and new 2-3 shift and 3-2 downshift valves from 1994, so keep the original valve body parts with your unit. Other parts for this family are on the 4T65E and 4T60E parts page.
| Fits | 4T60E 1991-1999 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The listing states it is for the 4T60E version built before the 4T65E. The 4T65E uses different parts and needs its own overhaul kit.
No. It contains gaskets, seals, O-rings, sealing rings and small rubber parts only. Frictions, steels, bands and the filter are bought separately if your teardown calls for them.
Read the identification tag on the transaxle case. Some GM cars switched to the 4T65E in those years, so the model year alone is not proof. You can also send us your year and VIN to check.
Not always. If it still shifts well, a pan gasket may be enough. The full kit makes sense when the transaxle is coming apart or leaks from several places.
A Dexron VI fluid. GM designed Dexron VI to be back-serviceable in transmissions that originally specified Dexron III. Check the level at operating temperature.
