We have for sale or trade a set of axles out of a 71 Chevy z-61. 3.73 ratio, Posi gear carrier. 
Upgraded to 3/4 ton axles in my 71. Front is a girdered dana 44 as you can see in the last pic. Rear is a 12 bolt with posi. Both have 3.73 gears. More pics available if needed.
Would consider a trade for a small car trailer, or a tire machine. Could use a good grille gaurd bumper. Or other tools or parts. Things that go bang are good, maybe a little shotgun, or lever action rifle. Whatcha got? Also have the factory rear leaf springs I could throw in on the deal