Re: What Differential is a good replacement?
Generally half ton GMC trucks from 60-66 and later years up to 68 came with the Dana 44 rear differential in both 2wd and 4wd. At some point the one in your truck was changed out. A 12 bolt would most likely be more readily available but the correct differential would be a Dana 44, same goes for 1955-59 GMC trucks.
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