Ford 9" 3.89 Ring & Pinion Gear Set 28 Spline
Ford 9" 3.89 Ring & Pinion. These ring & pinion sets are engineered, manufactured and tested for maximum performance. Ring & pinion is CNC machined from 8620 steel for durability, factory-lapped for precise fit and Rockwell tested for hardness. We offer many different ratios to fit a variety of differentials.