Strange Dana S60 width for a body

Yes it's mini tubbed and mono's are right under frame rail, the issues are
1: I don't think the 8.75 will last with our combo .
2: have about 2" to leaf, just a little less to inner tub
3: tires are centered pretty well but impossible to mount unless you drop rear unless you do fender mod, because of deep backspacing (7.25)
4: I'm thinking Dana maybe an inch or 2 shorter than A body's width may make it ??