2001 GMC C3500HD Ring and Pinion Set 4 X 2 - Dana 80 Rear - Ring and Pinion Set - 5.13 Ratio - Fits 4.10 & Up Carrier - Rear guaranteed to replace your current 2001 GMC C3500HD Ring and Pinion Set 4 X 2 - Dana 80 Rear - Ring and Pinion Set - 5.13 Ratio - Fits 4.10 & Up Carrier - Rear. 2001 GMC C3500HD Ring and Pinion Set comes new OEM 2001 GMC C3500HD Ring and Pinion Set aftermarket new 2001 GMC C3500HD Ring and Pinion Set of remanufactured 2001 GMC C3500HD Ring and Pinion Set 4 X 2 - Dana 80 Rear - Ring and Pinion Set - 5.13 Ratio - Fits 4.10 & Up Carrier - Rear.