Actually you don't have to jack the body up so much higher but enough that you can remove the tires and drop the axle down. I have a welding shop so blocking up the body wasn't much of a problem. Just make sure you are safe under there. One more piece of advice I would give is invest in new shocks while you are in there. I had to remove them to allow the axle to drop enough anyways and now have to remove the tires again and change them some day. Not as hard a job as one would think. Removing the old bolts is about the only occasion I found myself speaking French.
Glad to see you back around. Some of us missed you. Don't forget to drop on over to mcibustalk.com
also. Good to have you back.