1. do both vehicles have the same engine? if not, no way (and which engine?)
2. you just can't remove the t-case and connect the drive shaft, or even swap over the 2wd's tail section.
If you have the 4wd trans/t-case and drive shaft, and some ingenuity, you could swap the whole thing in.
You could have a 2wd truck with a low range
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84 4Runner rockcrawler - ARBed 5.29's, 36" TSLs, dual t-cases w/ 4.7 crawler gear, Chevys, 30 spline Marlins
83 p/u trail rig - Buick 231 V6, Weiand intake, Holley 4 bbl, TH-350 auto w/700R4 low gearset, dual tanks ...
89 4Runner - stock
http://www.cardomain.com/id/fourwd1