3.89 Ratio M/W-Gleason 10” produced 9310 alloy Ring and Pinion are the next step in durable gearing. This series gears have a ground tooth form and are Cold Stabilized, Shot peened and REM isotropic finished.35 spline input. Requires a case that has clearance for the larger gear and our 47679, 57678 or 57629 pinion support. This is the ultimate solution for the 9” type differentials.