Rear Oil Seal on 2004 4.0L
I'm replacing the clutch, slave, etc right now. Tranny is off, and clutch is off. I'm about to take off the flywheel. Should I replace the rear main seal? (you better have a good reason to say no..) If so the I have three questions.
First, do I need this seal replacement tool? (to push in the new seal)
Second, Is this a one piece deal, meaning do I have to remove the oil pan?
Third, I heard the original factory finish on the rear crankshaft snout seal surface was finished too smooth, so the rubber seal can't hold back the oil. (which is why so many 4.0L leak) Ford offers a "repair kit" that comes with a sleeve that has a rougher sealing surface that slips over the snout of the crankshaft, and a larger inner diameter rubber rear seal (p/n F5TZ-6701-A), but the kit costs about $60 at the dealership vs $20 for a "regular" seal. Any truth to this rough vs smooth seal business? (I heard there was a TSB on this, but I cannot find it, anyone have it?)