I didn't specify, but the part I'm worried about is making sure I don't screw up the backlash (not sure if that's the correct term). This short "how to" link makes it look simple. http://d44tech.com/axle_seals.html My truck has been known to go through shallow creeks during hunting season, so I definitely want to change them (both, while I'm in there). I reckon I'll give it a shot...unless someone here talks me out of it.