Find Ford rear-axle identification code lists at BlueOvalTrucks.com and Fordification.com. BlueOvalTrucks.com provides a chronological list of rear-axle codes as identified by the manufacturing code on the door sticker. Fordification.com presents a detailed graphic showing how to read rear-axle identification codes and provides detailed information on manufacturing codes.
Ford trucks use both Ford and Dana Spicer rear-axles depending on year, make and model. A differential identification guide is available at Differentials.com to help determine which manufacturer's information is needed. A Dana Spicer axle uses a different identification system for rear-axles than does Ford. Use the Dana Spicer bill of materials at Dana.com to identify the rear-axle information.