dodge had a 8 3/4 that was a 5 on 5.5 for the 4x4 trucks\

a c-body 8 3/4 is same width as a d-series truck RC/TD 9 1/4- 8 1/4

can be had small or large wbp

I used a 8 3/4 A-body 8 3/4 to tub my 88-440 truck. a-body truck share the same 43" perch centers so it a bolt in on top of the leaf with car u-bolts/shock plates

if you don't want narrow a c-body 8 3/4 only needs perches moved to 43" centers and on top of tubes for axle under leafs.

B-body D60 is what I would look for. then it only needs a perch spacing change

or take a 8 lug D60 and have it narrowed to 59" have car bearing cups welded on and buy Moser C-body axles good to 500HP.