i won't be home tomorrow or saturday. so i'm not instructional help. getting the arb out is self explanatory. unbolt the diff and pull.
don't know how soon kevin can get it done. if he can get it done before next weekend, the old diff won't need to go in. if not, than just bolt in new diff, slide axles all the way in, install c clips on ends of axle shafts and push/pull the axles out until they hit on the c clips. insert block in the middle and drop cross shaft through housing. install bolt/pin that holds the cross shaft.
install cover and fill to bottom of fill plug.
I will commit to getting it back in by next weekend!