5.50 9.5" 32 SPLINE INPUT SFL FORD PRO Richmond Gear 9.5" ring gear diameter 5.50 Ratio, 32 spline pinion, 9310 material. For use in MWE 57022 Pro Stock Low Friction Thirdmembers. The micro finishing process that these lightened gears have been treated with reduces friction and eliminates the need for break-in procedures required to assure long gear life.