I tackled the pinion seal today. The 1-5/16 nut that secures the yolk was ridiculously hard to break loose, even after repeatedly soaking it with penetrating oil the last couple days. After quite a bit of cranking on the cheater bar (on the breaker bar) it finally came loose. I had originally bought a pinion seal from Ford for a 89 D60 since I thought my axle was an 89. Needless to say it didn't line up and I ran to Oriels before they closed and picked up pinion seal, inner wheel seals and yolk hardware. The new seal went is easy and everything went back together smoothly. I don't know how many pounds the pinion nut is suppose to be torqued to so I just tightened as tight as I could.