I had a surprise. I bought the wrong part. The Dana 44 has two different size ring/pinion. I ordered a standard ring and pinion, but it is too small. I think I have to order a "thick". If the truck had a 3.92 (I think) or larger, then the standard is correct, but if it was smaller, then you need the other one.
So, I had my mechanic put the old one back in the front for now, and I just can't use my 4x4 (which really sucks in this country)