How do you Replace a rear main oil seal on a gm 455 engine?

To replace the rear main oil seal on a GM 455 engine, first, disconnect the battery and remove the transmission to access the rear of the engine. Next, remove the oil pan and the old seal, taking care to clean the sealing surfaces. Install the new seal, ensuring it’s seated properly, then reassemble the oil pan and transmission, and reconnect the battery. Finally, check for leaks by starting the engine and monitoring the area around the seal.