Pinion Seal Replacement
From Eaglepedia
Written by AMC Eagle Nest Member "Trapper Jack"
Things you will need
Seal I used from Advance Auto--part #470331N (Federal-Mogul)
1 1/8" socket for pinion nut
3/8 socket for u-joint
Tape to tape up caps on u-joint (don't want to lose the innards)
Drain pan to catch gear oil.
Breaker bar, torque wrench, impact wrench if you can round one up.
Paint or something to matchmark before removal.
Your starting point will probably look something like mine did