96 Pathfinder

Thanks for you replies on my thread about the FLEX PIPE. I guess that was a silly question (after all it is there for a reason). I'm starting to put all the pieces together. I got an oil leak thats pretty bad at the rear of the engine and at some point the oil pan has been droped I don't know if the rear main seal is leaking or if its the pan gasket. But as I check in a little further everyone is saying you got to pull the engine or drop the transmission or both?? To replace the oil pan gasket. That leads me to think at some point maybe the engine has been pulled? Which would make me think that the motor is not torque enough or something that caused the flex pipe to wear out. Anyhow thats not my concern. but the oil leak is. Everybody is saying the rear mains are a pressed in seal and are not notorious for leaking. If not wonder what it could be and how to go about fixing it? Any comments or Suggestions would be greatly appreciated.