4T60E Shift Kit 1991, new and ready to install. Fits the 4T60E. Ships fast from the USA.
A 1991 or later GM car with the 4T60E that shudders like it is driving over rumble strips at 45 mph, drops in and out of converter lockup on the highway, or keeps cooking its 2nd clutch is the car this kit was designed for. This page is for the TransGo SK 4T60E-JR, the Jr. version of TransGo's SHIFT KIT valve body repair kit. Although the title here reads 1991, the kit is not a single-year part: TransGo lists it for every 4T60E built from 1991 onward, so it covers the early electronic cars and the later 1990s units alike. It is sold for the Buick, Cadillac, Chevrolet, Oldsmobile and Pontiac front-drive models that used this transaxle.
In the 4T60E the computer decides when to shift and when to lock the converter, but the valve body decides how well it happens. The PWM valve and the lockup regulator valve meter oil to the converter clutch, and accumulators cushion each clutch apply. With high mileage and heat those valves wear their bores, lockup feed leaks off, and accumulator pins and seals get sloppy. The converter clutch then slips instead of clamping, which is the shudder you feel, and a 2nd clutch that fills slowly spends too long slipping and burns. The Jr. kit replaces the parts at those wear points instead of making shifts harsh: a new PWM valve, a lockup regulator valve assembly, hardened accumulator pins with tougher seals, and a self-expanding 3rd clutch seal that helps a cold 3rd gear apply on time.
Start with fluid level, color and smell, then pull codes. A lockup or shift solenoid circuit code with an open or shorted reading means the electrical side has failed, and the fix is a solenoid such as our 4T60E solenoid kit or, if the wires are chafed, the 4T60E internal wiring harness, not this kit. When the circuits test good and the shudder only happens during lockup, worn lockup valving is the usual cause. Our TCC shudder diagnosis guide walks through separating converter shudder from engine misfire, and the 4T65E common problems guide covers the related failures of the newer unit that grew out of this design. If the pan is full of friction material, the clutches are already gone and the kit belongs inside a rebuild, not in place of one.
TransGo's application is all 4T60E transaxles from 1991 on. It does not fit the 440-T4, the 4T40E, the 4T65E or the 4T80E, which look similar from under the car. GM used the 4T60E across several brands, and some late-1990s cars switched to the 4T65E, so confirm the unit by the ID tag on the case before ordering. If you are unsure, send us your year and VIN and we will check it. Every 4T60E and 4T65E part we carry is on the 4T65E and 4T60E collection page.
| Fits | 4T60E 1991 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes, if the car has a 4T60E. TransGo makes this kit for every 4T60E from 1991 on, so the year in the title is the start of the range rather than the only year it fits. Check the transaxle ID tag to make sure you have a 4T60E and not a 4T65E.
No. The Jr. kit is a repair kit aimed at converter lockup, PWM and accumulator wear. It corrects shudder, slip and clutch burn-up without the harsh shifts people associate with a performance kit.
It will when the code comes from worn lockup valving and the solenoid circuit tests good. If the code is caused by an open or shorted solenoid or a chafed internal harness, replace that part instead or as well.
In many cars the valve body can be reached with the transaxle in place by removing the side cover, but space varies by car. If clutches are already burnt the unit has to come out for a rebuild anyway.
Use a DEXRON-VI fluid. GM specifies it as backward compatible with the DEXRON III and DEXRON II fluids originally used in these transaxles. Check the level hot after the install.
