Remove the transaxle and then the driveplate. Inspect the Crankshaft Seal, oil pan, and engine block surface for signs of leakage, as an oil pan gasket leak can sometimes mimic a rear Crankshaft Seal leak. Carefully pry the Crankshaft Seal from the block using a screwdriver, taking care not to nick or scratch the crankshaft or seal bore. Clean the seal bore thoroughly with a shop towel, ensuring all oil and dirt are removed. Lubricate the lips of the new seal with engine oil or multi-purpose grease, then install it over the end of the crankshaft, ensuring the lips point toward the engine, and carefully tap it into place. A special aftermarket tool may be available at local auto parts stores to assist with this process; it fits the diameter of the seal and, when used with a hammer, drives the seal in without exceeding the depth of the original installation. Finally, reinstall the driveplate and then the transaxle.