you have to change BOTH axles in order to make your truck drivable in 4wd. the differentials and tire size MUST match, or you'll kill your transfer case. i would suggest finding a set of 3/4 ton axles. most commonly they came with 4.10 gears. the 4.10 gears shouldnt be a problem bieng that you have a 700R4. one down side to the 3/4 ton axles is they are 8 lug, where yours are 6. if your truck has stock steel wheels, it shoudlnt be much of a problem to just get another set of steel wheels. the ones off the donor truck may even work.
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