[sweetk30]

you need the 72" wms to wms drw wide axle housing as the tubes and shafts are wider .

if you cant find one and need to be close g-vans up to 1995 i know can be had with a 70" wms to wms then some swaping work with parts and welding axle backing plate flanges further in for the brakes to work on them for drw hubs and brakes . but you will be 1" each side to narrow compared to the correct wide drw axle .

also check motor homes they get a wide axle under them . i have one thats a dana 70 and around 74" wide .

as to the guts swapping thats super easy to do on the 14ff axles . so look for the housing width you need and swap in your 3.42 guts.