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Don't understand these types of questions.. why take apart a 4WD truck and try to put everything on a 2WD truck, when you can just fix the rear of the 4WD truck..I assume its all body damage.. Put the 2WD bed on the 4WD, paint it and call it a day.
This gets my vote. To convert a 2wd to 4wd would require too many electrics (the 4wd controller, switch, wiring, front differential, transfer case, front dirveshaft, and some other stuff I'm forgetting).