1968 Chevrolet G10 Van Ring and Pinion Set GM 12 Bolt Truck - Ring and Pinion Set - 3.42 Ratio - Fits 3 series 3.42 & Down Carrier - Rear guaranteed to replace your current 1968 Chevrolet G10 Van Ring and Pinion Set GM 12 Bolt Truck - Ring and Pinion Set - 3.42 Ratio - Fits 3 series 3.42 & Down Carrier - Rear. 1968 Chevrolet G10 Van Ring and Pinion Set comes new OEM 1968 Chevrolet G10 Van Ring and Pinion Set aftermarket new 1968 Chevrolet G10 Van Ring and Pinion Set of remanufactured 1968 Chevrolet G10 Van Ring and Pinion Set GM 12 Bolt Truck - Ring and Pinion Set - 3.42 Ratio - Fits 3 series 3.42 & Down Carrier - Rear.