Transmission Disassembly: Governor
WARNING: This page does not describe the selected car, but rather 124 other vehicles, including the 1991 Chevrolet Pickup, 1991 Chevrolet Cab & Chassis, 1988 GMC Vandura Special, 1988 GMC Vandura, and 1988 GMC Value Van. However, it is still accessible from the selected car via links, so may be relevant.
Remove attaching screws, cover, and governor assembly. On internal speed sensor equipped transmissions, remove retaining bolt, speed sensor and "O" ring, being careful not to distort cover. Remove governor assembly by pulling straight out of case.