1968 GMC G15-G1500 Van Ring and Pinion Set G15/G1500 Van - GM 12 Bolt Truck - Ring and Pinion Set - 5.13 Ratio - Fits 4 series 3.73 & Up Carrier - Rear guaranteed to replace your current 1968 GMC G15-G1500 Van Ring and Pinion Set G15/G1500 Van - GM 12 Bolt Truck - Ring and Pinion Set - 5.13 Ratio - Fits 4 series 3.73 & Up Carrier - Rear. 1968 GMC G15-G1500 Van Ring and Pinion Set comes new OEM 1968 GMC G15-G1500 Van Ring and Pinion Set aftermarket new 1968 GMC G15-G1500 Van Ring and Pinion Set of remanufactured 1968 GMC G15-G1500 Van Ring and Pinion Set G15/G1500 Van - GM 12 Bolt Truck - Ring and Pinion Set - 5.13 Ratio - Fits 4 series 3.73 & Up Carrier - Rear.