1991 Chevrolet S10 Truck Ring and Pinion Set RWD - GM 7.5 in. & 7.625 in Rear - Ring and Pinion Set - 3.73 Ratio - Fits 3.23 & Up Carrier - Rear guaranteed to replace your current 1991 Chevrolet S10 Truck Ring and Pinion Set RWD - GM 7.5 in. & 7.625 in Rear - Ring and Pinion Set - 3.73 Ratio - Fits 3.23 & Up Carrier - Rear. 1991 Chevrolet S10 Truck Ring and Pinion Set comes new OEM 1991 Chevrolet S10 Truck Ring and Pinion Set aftermarket new 1991 Chevrolet S10 Truck Ring and Pinion Set of remanufactured 1991 Chevrolet S10 Truck Ring and Pinion Set RWD - GM 7.5 in. & 7.625 in Rear - Ring and Pinion Set - 3.73 Ratio - Fits 3.23 & Up Carrier - Rear.