Description Product Reviews 8C3Z4215B AAM OE Ford 10.5" Open Differential Gear Kit 35 Spline 3 Pinion Design 3C3Z4215CA, 8C3Z4215CA, F10.5BI, F81Z4215AA, 8C3Z4215B -- MUST PURCHASE 3 PINION CROSS SHAFT ALSO 3C3Z4211AB