not tough, but very specific.
after you pull the cover,wheels, and brake drums,
remove the bolt and cross shaft from the ring gear carrier.(5/15" wrench) push axle shafts in and remove c clips (from inside the carrier) pull axle shafts out.
mark and remove 2 side bearing caps (thay are line bored, don't mix them up)
carrier should now drop out, may need a pry bar.
don't mix up the shims on either side of the side bearings (if your lucky, you can reuse them)
remove drive shaft and nut at pt pinion yoke.
drive pinion out (use a hunk of brass don't damage the threads)
heres the fun part.
once the bearings are changed and you are reassembling, the pinion nut must be tightened to achive a specific setting. (need a dial type inch pounds torque wrench for this)
it should take 10--20 inch lbs. to rotate the pinion . this is the pinion bearing pre load.
to much and they will burn up in no time flat.
reinstall carrier, those cast iron shims move the ring gear in and out of the pinion toget a back lash of .005"- .009".
gotta leave for work. i'll try to finnish this this evening if some one else doesn't beat me to it.