Pinion seal or axle seals? Axles are straight forward, remove rear cover, pull the pin out of the center of the carrier(holding the spider gears), shove the axles inwards, pull the axle retainer c-clips, pull the axles out and replace the seals(add a dab of axle oil on the seal before sliding the axle in). Pinion, set the e-brake and remove the nut and remove the pinion drive yoke. Remove and replace the seal, again lube the seal before replacing the yoke. Add lock-tite to the pinion threads and torque to specs, something like 15 inch pounds of resistance before the pinion turns. Can't remember the exact number. I like to take a chisel, once I'm satisfied I have the torque correct, and knock a groove in the threads and the end of nut to keep it from backing off accidentally.