I'd guess an 8 1/4 with brake drums but no leaf springs is in the 150 lbs range. I remember in my younger days carting a few to the scrap yard by myself. I didn't want to carry them very far or very long, but I could pick them off the truck tailgate alone.
A Dana 60 or even a 9 1/3 was a different story. I think just the center section of an 8 3/4 weighed more then a whole 8 1/4 did. Gene