Used OEM Ford 9" 3.56 Ring/Pinion that was rusty but was media blasted. Slight signs of pitting & stains but feels smooth. A good used original part is as good as or better than a new aftermarket part.
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ARP 250-3020 - 9" Pinion Support Stud Kit Blk For Ford 9 Inch 3/8-16 3/8-24