4T60E Overhaul Kit 1991-94, new and ready to install. Fits the 4T60E. Ships fast from the USA.
This 4T60E overhaul kit is listed for the early electronic units built from 1991 through 1994, the first years GM put computer shift control into its chain-drive front-wheel-drive transaxle. Those transaxles are now thirty-plus years old, and the usual story is an early-1990s Buick, Oldsmobile, Pontiac or Chevrolet that has started slipping, flaring on the 1-2 shift, refusing Reverse, or pumping out burnt fluid. When it reaches that point a reseal will not save it. Per the listing, this kit carries Borg-Warner friction plates and the matching steel plates, a Transtec soft parts set with the rubber seals and gaskets for the complete overhaul, a new filter and all three bands. Pistons are not in this kit.
Inside the 4T60-E, clutch packs and three bands (forward, 1-2 and reverse) hold the gear members, and the seals let line pressure apply each one. On an early unit the lip seals and sealing rings have usually gone hard and the frictions are glazed or worn down to the core, so pressure bleeds off and the parts that should lock start to slip and overheat. This kit replaces those wear items together. Since pistons are not supplied, plan a careful look at each one during teardown: a cracked piston or a torn bonded lip will leak just like an old seal, and that leak will undo the rebuild.
Check codes and the fluid, then pull the pan. Heavy friction debris plus slip confirms the clutches need replacing. If the fluid looks reasonable but shifts are soft, test line pressure first: Sonnax lists worn boost valves and an oversized pressure regulator repair for this valve body, and those faults mimic worn clutches. Lockup complaints point to the TCC circuit, which a 4T60-E TCC solenoid or valve body repair addresses rather than this kit. The 4T65E evolved from this design, so our 4T65E diagnosis guide and delayed engagement guide work as a checklist here too.
The listing covers 1991-1994 4T60-E transaxles in GM, Chevrolet, Buick, Oldsmobile and Pontiac cars. GM made running changes in this span; Sonnax notes the TCC regulator valve was revised for 1993-later units and the 2-3 shift valve and 3-2 manual downshift valve changed from 1994. Those changes sit in the valve body, but they show why matching your exact unit matters. Read the identification tag on the case, or send us your year and VIN to confirm before it ships. Our identification guide shows where the tag is. For a 1995 or later transaxle, use the 1995-up 4T60E overhaul kit. Other parts for this family are on the 4T65E and 4T60-E parts page.
| Fits | 4T60E 1991-94 |
| 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 pistons are not included. Inspect yours during teardown and replace any that are cracked or have torn bonded seals.
Per the listing: Borg-Warner frictions, steel plates, a Transtec soft parts set with seals and gaskets, a filter and all three bands.
It is listed for 1991-94 units. A 1995 or later 4T60-E should use the 1995-up kit. Send your VIN if you are not sure which unit you have.
Not by itself. Lockup problems on the 4T60-E are often the TCC solenoid or TCC regulator valve. Diagnose that circuit before deciding on a full overhaul.
Dexron VI. GM designed it to be back-serviceable in transmissions that originally used Dexron III.
