1993 GMC Pick-up Truck Ring and Pinion Set K1500 - 4WD - GM 8.5 & 8.6 in. - 10 Bolt - Ring and Pinion Set - 5.57 Ratio - Rear guaranteed to replace your current 1993 GMC Pick-up Truck Ring and Pinion Set K1500 - 4WD - GM 8.5 & 8.6 in. - 10 Bolt - Ring and Pinion Set - 5.57 Ratio - Rear. 1993 GMC Pick-up Truck Ring and Pinion Set comes new OEM 1993 GMC Pick-up Truck Ring and Pinion Set aftermarket new 1993 GMC Pick-up Truck Ring and Pinion Set of remanufactured 1993 GMC Pick-up Truck Ring and Pinion Set K1500 - 4WD - GM 8.5 & 8.6 in. - 10 Bolt - Ring and Pinion Set - 5.57 Ratio - Rear.