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that's what i would do as well. i swapped a broncoII body onto a chevy full sized frame rather than try to adapt all of the parts to the bII frame. (stronger axles, stranger trans, stronger t-case, trying to stuff a chevy motor between the narrow ranger frame-rails those are all of the same problems you will face)I'd likely rebody a Ranger body onto something that already has a 7.3 PSD in it.
This is what I was referring to.A 6.0 fits, but it takes a lot of work.