The new rear oil seal is installed, after a neighbor took pity on me and brought out his impact wrench. I tried for half an hour to get the pinion nut off by hand, so that I could get to the oil seal.
5 minutes with the impact wrench, and I was ready to install the new seal that I bought at AutoZone a while back. Too bad it was the wrong part. Since I had to run over anyways, I picked up the rear differential gasket, so that I could close everything up on the rear end.
I may tackle the tranny oil seal this afternoon. Then I have to remove and reinstall the u-joints in the driveshaft and install a new carrier bearing. After getting the driveshaft back in place, I'll need to refill the transmission fluid and reattach the speedometer cable.
If I can get these leaks stopped, then I'll only have the oil pan dripping on the driveway.