Hey smilely, a quick way to tell the difference between a D44 and a D60 is the size of the diff cover bolts. D44 takes a 1/2" socket and the D60 takes a 9/16" socket. It deffinatley looks to be a d44 from here. probably from a Chevy by looking at the passenger u-bolts not to mention the 14bolt that is with it. 3/4 ton stuff.
Just my.02, since I haven't been around in a while.

-Chad