Re: What axle do i have?
The 1/2 ton GMC's with the leaf springs typically had Dana 44's. Probably not the best differential for your application. Probably the easiest and most economical swap would be a 12 bolt. They will take a fair amount of abuse in stock form and there are lots of aftermarket parts available for them. If you want to stay with 6 lugs, look for one out of a pre 1980 K10 or K5 Blazer.
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