Hope you've been doing some research, many threads on the forums with several different installations. The Explorer donor is about the best method if looking to maintain 4x4, if not too messed up or gutted out. Mostly left up to what you want to do or how anxious about getting an upgrade in power. Rwenzing has a great writeup on cardomain for the 4x4 setup.

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87 Ranger
5.0 (306) from worn out gt mustang
Exploder 31 spline tracloc,linelockin 3:55 rear w/discs
S & R Customs in the works...

PNW Crew...