Chrysler 9.25 Inch Rear 3.55-4.10 Ratio Dual Drilled Face Hobbed Ring Pinion Revolution Gear and AxleRevolution Gear and Axle ring and pinion manufactured to be compatible with Chrysler 9. 25 Inch differentials from 1970 2018. Chrysler 9. 25 Inch ring and pinions are dual drilled and manufactured with the same gear cutting processes as the OE brands, utilizing a Face Hobbed or 2 Cut gear cutting style followed by lapping. Face hobbed gears can be easily distinguished by the equal gear height from heel to toe. Face hobbed gears produce lower noise and