Motive Gear F888430 8.8" Rear Ring and Pinion for Ford (4.30 Ratio) 8620 Steel Performance Differential Ring And Pinion Ratio: 4.30 Pinion Spline: 30 Ring Diameter: 8.8 Pinion Diameter: 1.626 Ring Gear Teeth: 43 Pinion Teeth: 10 Position: Rear