Raise the vehicle and support it securely on jackstands. Remove the transmission assembly. If the vehicle has a manual transmission, remove the pressure plate and clutch disc, taking the opportunity to check or replace the clutch components. To ensure correct alignment during reinstallation, mark the position of the flywheel/driveplate to the crankshaft before removal. Remove the bolts that secure the flywheel/driveplate to the crankshaft, marking the relative position and using an appropriate tool to hold the flywheel while loosening the bolts; if the tool is unavailable, wedge a screwdriver in the ring gear teeth to jam the flywheel. Carefully remove the flywheel/driveplate from the crankshaft, supporting it while removing the last bolt. Clean the flywheel to remove grease and oil, and inspect it. Clean and inspect the mating surfaces of the flywheel/driveplate and the crankshaft, replacing the crankshaft rear main seal if it is leaking before reinstalling the flywheel/driveplate. Position the flywheel/driveplate against the crankshaft, aligning the previously applied match marks, and apply thread locking compound to the bolt threads before installation. Hold the flywheel/driveplate with the holding tool or wedge a screwdriver in the ring gear teeth to prevent it from turning while tightening the bolts to the specified torque. The remainder of the installation follows the reverse order of removal.