welcome to the forum, first of all your front is a dana 30, they all are 30's untill the rubicon. your rear is most likely a dana 35 unless you are lucky and it has the very less comon d44 out back. either way get yourself 5 qts of 80w90 gear oil, a gasket scraper, and a tube of rtv and you're ready to cause some damage.
here's a link that will help you determine which rear axle you have: Axle Identification Chart
if its limited slip in the rear most synthetic gear lubes will have the additives already.