1972 GMC Sierra long bed 2wd to 4wd project(need answers)

[silorss]

I have an all original 120,000 mile truck,its a 1/2 ton long bed.I am wanting to convert it from 2wd to 4wd,but I don't want to remove the cab from the existing frame. 73 - 87 4x4s r plentiful.my question is if I find one can I use 73 to 85 spring hangers front n rear n all 4x4 components and them mount right up ? Any answers woukd b greatly appreciated thanx
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