You would have a 7.5 diff with the crappy 9inch brakes, or at least thats what my 85' 2.8l longbed had. you could weld up the front but that puts alot of strain on components. I'd suggest grabbing a d35 and 8.8 out of an explorer as there much stronger and have a better market for lockers, posi's, ect. if ya do swap axles its a bolt in swap. Idk where in colo. you are but there is a junk yard off 58th and federal called western and they got the cheapest prices around town. I got my complete 8.8 for 75$ drum to drum and the complete d35 for 100$. If ya do weld it up, i'd get a couple spare shafts are get ready to change them out alot- especially with that d28 pos.