Here's how I see it. If you are getting oil in the transmission cover then I would want to go through the clutch. In order to go through the clutch the transmission has to come out. If the transmission is out then I would want to remove the flywheel and get that resurfaced before replacing any clutch parts. So now the only thing left is pull the front sheet metal and the engine is sitting there wide open on the frame. Pulling the engine from there is a cinch. Then you can rig an engine stand or borrow one and replace all of the seals with the engine out of the truck. To me the hassle of replacing the rear-main on an old engine is just not worth the effort. For another week or two you can replace all of the seals, flywheel, and clutch kit and be done with so many other potential problems with only a fraction more effort. But then I'm just a dumb old guy from San Diego.
