2500 gmc savana rear end?
 

my 2500 truck has a drain plug on the rear. 14 bolt 10.5 full floater. my dad needed to change his fluid in his van and i told him it was cake becuase it has a drain plug, not to buy a gasket. well he went to change it and he says there is no drain plug. its for sure not a 14 bolt.

i did some searching, but didnt come up with much.
im just curious to what it is. he bought the van new with 3.73's if it matters.
06 6.0

cant mind much. looks like a dana 70. 9" ring gear, 10 bolt cover. several versions via vin # 70 70S 70HD.