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Hi. I have a dana 70HD out of a chevy c30 1974. It has 23 spline 2 piece carrier. Stock 3.73 gear. I want to change to a 4.56. What ring and pinion do I need? Is the pinion 5/8 offset the dana 70HD?
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It is hard to find a c30 squarebody FF 14 bolt without 4.56 ratios.

If you want that ratio start looking for a FF 14 bolt. Direct bolt in, strong, easily serviced, with less variations then a 70 allowing for a strong aftermarket.

If this is not a dually then that changes things.
 
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