For a D-44 rear you can also look for a 70(?)-up Commando (look for the boxy ones that no one but me seems to like) or 72-75 CJ. Both are 30 spline flanged axle units. The commando rear is a bolt in, you would have to move the perches on the CJ.
72 CJ-5: 305 Chevy; SM420; D-300; 30/44 with 5.38's, Warn axles, and Detroits