Motive Gear F888410IFS Front Ring and Pinion for Ford (4.10 Ratio, 8.8 IFS) 8620 Steel Performance Differential Ring And Pinion Ratio: 4.10 Pinion Spline: 30 Ring Diameter: 8.8 Pinion Diameter: 1.626 Ring Gear Teeth: 41 Pinion Teeth: 10 Position: Front