its big, thats forsure..
for your rear axle, your best bet would just be a tru trac and at least some 4.88 gears at least..you dont off road it that much, so that should get you by
to put a dana 60 (in this case a 6 lug, 14 bolt semi floater would be your best bet) you would have to strip the rear end, weld on the 4 link tabs, shock mounts, hope its the right width etc...