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As for the front i would just do the swap. It's heavier work but not as much, especially if you want that posi. As far as the rear goes chevy lists 2 different part numbers for 67-70 - 71-72 for rear drum shoes, so the drum size could be different between the two but the housing is the same. I would remove the rear diff cover of both and inspect the ring & pinion of each and roll with wich ever one looks fresher.
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