Ford Repair: general question, auto setup, diesel auto

Question
Maybe you can help me...Im looking into buying a rear axle from an individual and I havent seen it yet but it is from a 1985 or 1986 f350 DUALLY (for my custom project) and Id kinda like to know what kind of axle it is probably going to be. It had a diesel/auto setup, too. Would it most likely be a Dana 70, 80,or just a wider version of the Ford 10.25? Could it have a limited parts/gear ratio availability for any reason? Any info would be helpful. Thanks   (just want to know if its worth going to look at)

Answer
Hello and thanks for the question...I'll try to help.
 What I would suggest you do is contact the person and get a tag # off of it. Then, call your local dealership and have them cross the number for you. I can't venture a guess as to what will be in the vehicle.
Hope this helps,
Erik