1968 Dodge Polara Ring and Pinion Set Chrysler 8.75 in. Rear - w/ 489 Case Housing - Ring and Pinion Set - 4.56 Ratio - 29 Spline Pinion - 1.875 in. Diameter Pinion Bearing Journal - Rear guaranteed to replace your current 1968 Dodge Polara Ring and Pinion Set Chrysler 8.75 in. Rear - w/ 489 Case Housing - Ring and Pinion Set - 4.56 Ratio - 29 Spline Pinion - 1.875 in. Diameter Pinion Bearing Journal - Rear. 1968 Dodge Polara Ring and Pinion Set comes new OEM 1968 Dodge Polara Ring and Pinion Set aftermarket new 1968 Dodge Polara Ring and Pinion Set of remanufactured 1968 Dodge Polara Ring and Pinion Set Chrysler 8.75 in. Rear - w/ 489 Case Housing - Ring and Pinion Set - 4.56 Ratio - 29 Spline Pinion - 1.875 in. Diameter Pinion Bearing Journal - Rear.