4T60E Master Rebuild Kit 1991-92, new and ready to install. Fits the 4T60E. Ships fast from the USA.
The 1991 and 1992 model years were the first for GM's electronic 4T60E, the computer-controlled version of the older hydraulic 4T60 (440-T4) used in front-drive GM cars. Thirty-plus years on, the ones still on the road tend to show up with the same complaints: a flare between gears, a slow or harsh engagement into Drive or Reverse, slipping once the car is warm, or a pan full of dark fluid. This master rebuild kit is listed specifically for those 1991-92 units, and it is new, so the wear parts inside the unit are replaced all at once instead of one failure at a time.
The 4T60E drives through a chain to a four-speed planetary gearset, with clutch packs and two bands applied by line pressure in a set order for each gear. A master kit is the full wear package for that job: the frictions, steels, seals and gaskets needed to reline every clutch pack and reseal the case, pump and side cover. On a unit this age the rubber is the bigger problem than many owners expect. Lip seals and bonded piston seals harden, so oil bleeds past them, apply times stretch out, and the clutches start to slip and burn. Our listing names the kit as a master kit without itemizing every piece, so if you need to know whether a specific band, filter or piston is in the box for your rebuild, ask us before ordering and we will confirm the contents.
Transmission Digest makes a point that matters on these early cars: unlike the later 4T65E, the 4T60E has no turbine speed sensor, so the computer cannot detect a slipping clutch and set a code for it. A slipping 1991-92 unit may show nothing on a scan tool. Diagnose it with a pressure test, a road test and the pan contents. Low line rise from a worn pressure regulator or boost valve bore feels just like worn clutches, and new frictions on top of it burn quickly. The 4T65E common problems and diagnosis guide covers the shared hydraulic layout, and the pump failure guide helps rule out a pump that cannot make pressure.
This kit is listed for 1991-1992 4T60E transaxles. That window matters because GM revised the unit soon after: Sonnax lists a different TCC regulator valve for 1993 and later units and a new 2-3 shift valve and 3-2 manual downshift valve from 1994, so 1991-92 transaxles are the original design in several places. Confirm that your car has the electronic 4T60E and not the hydraulic 4T60, check the ID tag on the case, and send us your year and VIN if you want a fitment check. For a 1993 or 1994 unit see the 1991-94 4T60E master rebuild kit, and for 1995 and later the 1995-up kit. Other parts for this family are on our 4T65E and 4T60E parts page.
Soak the frictions and bands in fluid before assembly and measure every clutch pack. GM does not publish clearances for these units, and Transmission Digest notes that 4T60E and 4T65E second and third clutches often come out loose even with the correct parts. Inspect the drums, bushings and the pump, and look closely at the valve body; an early casting with worn bores is a common reason a rebuild comes back, and the 1991 4T60E valve body is an option if yours is badly worn. With the side cover off, consider a 4T60E solenoid kit. Fill with Dexron VI, which GM made back-serviceable into older Dexron applications like this one.
| Fits | 4T60E 1991-92 |
| Part type | Master Rebuild 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.
It is listed for 1991-92 units. GM made internal changes starting in 1993, so for 1993-94 use our 1991-94 kit, or send us your year and VIN and we will check.
The 4T60E is the electronically controlled version, with shift solenoids and a wiring connector into the side cover, while the hydraulic 4T60 (440-T4) uses a throttle valve cable. Check the ID tag on the case and confirm with your VIN.
The 4T60E has no turbine speed sensor, so the computer cannot measure clutch slip and set a gear ratio code. Diagnose slipping with a road test, pressure test and pan inspection.
Any worn drums or bushings, the solenoids if they are original, and a worn valve body. Flush the cooler and lines and service or replace the torque converter, which holds debris from the old clutches.
Dexron VI. GM designed it to be back-serviceable into transmissions that originally used earlier Dexron fluids.
