2001 Ford F Series Trucks Ring and Pinion Set F-350 Super Duty - RWD - Dana 80 Rear - Ring and Pinion Set - 5.13 Ratio - Fits 4.10 & Up Carrier - Rear guaranteed to replace your current 2001 Ford F Series Trucks Ring and Pinion Set F-350 Super Duty - RWD - Dana 80 Rear - Ring and Pinion Set - 5.13 Ratio - Fits 4.10 & Up Carrier - Rear. 2001 Ford F Series Trucks Ring and Pinion Set comes new OEM 2001 Ford F Series Trucks Ring and Pinion Set aftermarket new 2001 Ford F Series Trucks Ring and Pinion Set of remanufactured 2001 Ford F Series Trucks Ring and Pinion Set F-350 Super Duty - RWD - Dana 80 Rear - Ring and Pinion Set - 5.13 Ratio - Fits 4.10 & Up Carrier - Rear.