This Link is for a GM 8.875" 12-Bolt Diff rebuild, the Ford 8.8" Diff is basically the same style Rear. It's a very detailed Build so it should help you out.
http://www.webrodder.com/article.php?AID=134&SID=60
One more >>
http://www.hotrod.com/techarticles/d...install_guide/
Using a Solid Pinion Spacer would make the Install much easier, you don't have to worry about all the torque required for that Crush Sleeve.