Here are the general steps involved in replacing a rear main seal on a 1996 F150:
1. Gather the necessary tools and parts, including a new rear main seal, oil pan gasket, oil filter, and transmission fluid.
2. Park the vehicle on a level surface and turn off the engine. Allow the engine to cool down completely.
3. Disconnect the negative battery cable.
4. Remove the transmission fluid pan.
5. Remove the oil pan.
6. Pry the old rear main seal out of the oil pan using a pry bar or similar tool.
7. Clean the sealing surfaces of the oil pan and engine block.
8. Apply a thin bead of silicone sealant to the sealing surface of the new rear main seal.
9. Press the new rear main seal into the oil pan.
10. Reinstall the oil pan and transmission fluid pan.
11. Add new oil and transmission fluid to the vehicle.
12. Reconnect the negative battery cable.
13. Start the engine and check for leaks.
It is important to note that this is a general overview of the steps involved in replacing a rear main seal on a 1996 F150. The actual process may vary depending on the specific vehicle model and engine. It is always best to consult a qualified mechanic before attempting this type of repair.