5.38 Richmond Gear 9.5" ring gear diameter 5.38 Ratio, 32 spline pinion, 9310 material. Are used in MWE 57022 Pro Stock Low Friction Thirdmembers. The ring and pinions can be used in a Thirdmembers that has 28 or 35 pinion, by changing to a 57675 Pinon Support and using a 39936 aluminum yoke or a 40060 coupler. These gear sets offer larger input 32 spline size for increased strength over the smaller 28 spline pinion.