1973 AMC Javelin Ring and Pinion Set Model 20 Rear - Ring and Pinion Set - 3.73 Ratio - 28 Spline Pinion - Fits 3.08 & Up Carrier - Rear guaranteed to replace your current 1973 AMC Javelin Ring and Pinion Set Model 20 Rear - Ring and Pinion Set - 3.73 Ratio - 28 Spline Pinion - Fits 3.08 & Up Carrier - Rear. 1973 AMC Javelin Ring and Pinion Set comes new OEM 1973 AMC Javelin Ring and Pinion Set aftermarket new 1973 AMC Javelin Ring and Pinion Set of remanufactured 1973 AMC Javelin Ring and Pinion Set Model 20 Rear - Ring and Pinion Set - 3.73 Ratio - 28 Spline Pinion - Fits 3.08 & Up Carrier - Rear.