How do you replace a rear main seal on a 1984 mercury grand marquis?

To replace the rear main seal on a 1984 Mercury Grand Marquis, first, you'll need to remove the transmission and torque converter to access the rear of the engine. Once the engine is exposed, remove the oil pan and any necessary components to reach the rear main seal. Carefully pry out the old seal and clean the area before installing the new seal, ensuring it is seated properly. Reassemble by reversing the disassembly steps, making sure to replace any gaskets and check for leaks after reinstallation.