1986 GMC Pick-up Truck Ring and Pinion Set C3500 - RWD - Dana 70 Rear - Ring and Pinion Set - 7.17 Ratio - 5/8 in. Offset - 29 Spline Pinion - Fits 4 Series 4.56 & Up Carrier - Rear guaranteed to replace your current 1986 GMC Pick-up Truck Ring and Pinion Set C3500 - RWD - Dana 70 Rear - Ring and Pinion Set - 7.17 Ratio - 5/8 in. Offset - 29 Spline Pinion - Fits 4 Series 4.56 & Up Carrier - Rear. 1986 GMC Pick-up Truck Ring and Pinion Set comes new OEM 1986 GMC Pick-up Truck Ring and Pinion Set aftermarket new 1986 GMC Pick-up Truck Ring and Pinion Set of remanufactured 1986 GMC Pick-up Truck Ring and Pinion Set C3500 - RWD - Dana 70 Rear - Ring and Pinion Set - 7.17 Ratio - 5/8 in. Offset - 29 Spline Pinion - Fits 4 Series 4.56 & Up Carrier - Rear.