1988 Ford F Series Trucks Ring and Pinion Set F-350 - RWD - Dana 80 Rear - Ring and Pinion Set - 3.54 Ratio - Fits 3 Series 3.73 & Down Carrier - Rear guaranteed to replace your current 1988 Ford F Series Trucks Ring and Pinion Set F-350 - RWD - Dana 80 Rear - Ring and Pinion Set - 3.54 Ratio - Fits 3 Series 3.73 & Down Carrier - Rear. 1988 Ford F Series Trucks Ring and Pinion Set comes new OEM 1988 Ford F Series Trucks Ring and Pinion Set aftermarket new 1988 Ford F Series Trucks Ring and Pinion Set of remanufactured 1988 Ford F Series Trucks Ring and Pinion Set F-350 - RWD - Dana 80 Rear - Ring and Pinion Set - 3.54 Ratio - Fits 3 Series 3.73 & Down Carrier - Rear.