Dana 44 Axle and u-joint help

[BrianG]

I am still a bit confused by one thing. The axles under my truck were the necked down smaller diameter axle shafts. The one that I'm putting back in are from the larger diameter housing and are the larger diameter axle shafts. I've read in many places that the u-joints are different, but I can not see any difference in them. I don't have pics handy of them but I told the parts guy I wanted u-joints for a 72 and they fit perfectly into the 76 shafts. Maybe this is a case of crossover. I do believe that the u-joints in the smaller shafts have been changed so maybe they were changed out to the larger joints. The u-joints in the larger axle shafts were original.