I have a 95 YJ 2.5L 5 spd and have been holding off on replacing the clutch until it gets warmer. Now it appears that my rear main seal is leaking. What do I have to do to replace the rear main seal while the engine is in and the trans is out. Is the seal a one piece or two piece? If it is a one piece, do they make a 2 piece to ease installation? Thanks in advance for your knowledge.