Shift Lever Seal Installer Remover Transmission Tool. Fits for GM 200, 200C, 200-4R TURBO 350, 350C TURBO 400, 425, 475 GM 700-R4 GM 4L60 GM Allison – 540. The tool goes over the shaft. Screw the the removal tool onto the leaking seal (counterclockwise) to engage the seal with the tool LH threads, and turn the hex bolt to remove the seal.