1972 Dodge Pick-up Truck Ring and Pinion Set D200 Pickup - Chrysler 9.25 in. - 3.21 Ratio - 29 Spline - 9.25 in. Ring Gear Diameter - Rear guaranteed to replace your current 1972 Dodge Pick-up Truck Ring and Pinion Set D200 Pickup - Chrysler 9.25 in. - 3.21 Ratio - 29 Spline - 9.25 in. Ring Gear Diameter - Rear. 1972 Dodge Pick-up Truck Ring and Pinion Set comes new OEM 1972 Dodge Pick-up Truck Ring and Pinion Set aftermarket new 1972 Dodge Pick-up Truck Ring and Pinion Set of remanufactured 1972 Dodge Pick-up Truck Ring and Pinion Set D200 Pickup - Chrysler 9.25 in. - 3.21 Ratio - 29 Spline - 9.25 in. Ring Gear Diameter - Rear.