Chevy Hydraulic Throwout Bearing Kit - Muncie, Saginaw, T10, TKO-500/600

This is a concentric hydraulic release bearing that mounts to the front of the transmission and pushes straight on the pressure plate fingers, so you can delete the Z-bar, clutch fork, and bellcrank linkage entirely. It fits Chevrolet, BOP, and GMC manual 3- and 4-speeds - Muncie series, Borg Warner T10, and Saginaw - plus GM-spec Tremec TKO-500 and TKO-600 5-speeds when you are running a stock-style diaphragm pressure plate.

Installation replaces one existing bolt at the transmission front face. The kit ships with anti-rotation studs so the bearing cannot spin under load, and air gap shims to set the clearance between the bearing face and the pressure plate fingers. Set that gap on the bench before the trans goes back under the car - too little and the bearing rides the fingers and burns up, too much and you run out of travel and never fully release the clutch.

The housing is a redesigned version with no boss and a built-in fail-safe retainer that stops the piston from over-extending and blowing the seal, which is the usual failure on cheaper hydraulic bearings. Bleeding can be done through the standard port or converted to an external bleeder setup if the bellhousing does not give you room to reach it. Travel is .688 inch and the low-profile body clears thicker aftermarket pressure plates.

The practical reason people go this route: a swapped engine or a modern 5-speed usually leaves nowhere to hang the stock Z-bar, and hydraulic release gives noticeably lower pedal effort than the mechanical linkage it replaces. Common on muscle car restos, hot rods, and SBC swaps where the factory linkage geometry no longer exists.