1998 GMC Sierra Ring and Pinion Set C3500 - RWD - Dana 80 Rear - Ring and Pinion Set - 3.31 Ratio - Fits 3 Series 3.73 & Down Carrier - Rear guaranteed to replace your current 1998 GMC Sierra Ring and Pinion Set C3500 - RWD - Dana 80 Rear - Ring and Pinion Set - 3.31 Ratio - Fits 3 Series 3.73 & Down Carrier - Rear. 1998 GMC Sierra Ring and Pinion Set comes new OEM 1998 GMC Sierra Ring and Pinion Set aftermarket new 1998 GMC Sierra Ring and Pinion Set of remanufactured 1998 GMC Sierra Ring and Pinion Set C3500 - RWD - Dana 80 Rear - Ring and Pinion Set - 3.31 Ratio - Fits 3 Series 3.73 & Down Carrier - Rear.