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Rear Drive Axles Model Numbers and Designations - OLD STYLE RR 20 1 4 5 N C Q F 123 NOTE 1: NOTE 2, FOR TRIDEM AXLES ONLY: If a complete axle designation is not required, use the first seven positions For a Tridem Drive Axle Set (RZ), theof the model designation to identify the basic axle model. number in the sixth position designates