I was changing the oil in my truck earlier last week and saw that my right rear axle seal was leaking. So I figured what the hell, I'll do a how-to thread for replacing axle seals and bearings. While this was specifically done on a 2004 F150 with a 9.75 axle, 8.8s are very similar.
First thing's first, the parts:
Front row, from left to right - the axle seals themselves (p/n 5L3Z-1S177-AB, about $6.05/ea), the axle bearings (p/n 5L3Z-1225-AA, about $67.00/ea), and for limited slip differentials, one bottle of friction modifier (p/n XL-3, about $10.00) and four quarts of 75W140 gear oil.
You may or may not have access to an air compressor, so disregard the air tools in that picture if you don't. This can all be done with hand tools, it'll just take a little longer. You'll want a breaker bar and a 21mm socket for removing the wheels; a 10mm socket or ratchet wrench for removing the calipers; a BFH for beating the rotors off (if necessary, mine just slid off) and for beating the new bearings and seals in; a 6 point
(more on why a 6 point later) 3/8" wrench or socket; a 13mm socket for removing the bolts that hold the rear axle cover on; a couple of standard prybars; a rolling head prybar; and a slide hammer and axle bearing puller. In the red case is a set of bearing and seal drivers - not absolutely necessary, but nice to have.
First of course, you've got to get your truck in the air.
Important safety tip guys: If you're doing this in your driveway, secure your truck
. You're gonna be underneath 2-1/2+ tons of vehicle, I don't want to see anyone get hurt. Good jack stands in the rear, and chock the wheels in the front. Continued in next post...