TransGo SK 4L60E Shift Kit for GM 4L60E Automatic Transmissions (1993-On)

The 4L60E is a good transmission with a couple of well-known weak spots, and almost all of them live in the valve body. From the factory the shifts are soft and slow, the 1-2 and 2-3 flare when the fluid warms up, and the torque converter clutch applies so gently that it glazes over and starts setting codes. Rebuild the unit and put it back together stock and you inherit every one of those habits again. This TransGo kit is what you drop in while the valve body is on the bench to fix the design instead of just replacing worn parts with more of the same.

The kit reworks the shift timing and line pressure so the clutches and bands apply with a firm, clean stroke instead of dragging through the change. That does two things at once: the truck shifts crisp and consistent, and the clutches spend far less time slipping during the shift, which is what actually cooks a 4L60E over time. It also tightens up the TCC apply so the converter locks positively instead of shuddering, which keeps the converter clutch and the fluid cooler. You get the valves, shims, spacers, and springs, and instructions detailed enough to follow on the bench.

It fits the GM 4L60E family from 1993 on, the transmission behind small blocks in Silverados, Sierras, Tahoes, Suburbans, Yukons, Camaros, and the rest of the GM rear-drive lineup. Whether you are freshening a high-mile unit, chasing a soft-shift complaint, or building a truck that tows, this is a cheap, permanent upgrade that belongs in every 4L60E rebuild. Ships from the USA.