1972 GMC Pick-up Truck Ring and Pinion Set C15/C1500 Pickup - Dana 60 - High Performance Replacement - 5.38 Gear Ratio - Thick - Rear guaranteed to replace your current 1972 GMC Pick-up Truck Ring and Pinion Set C15/C1500 Pickup - Dana 60 - High Performance Replacement - 5.38 Gear Ratio - Thick - Rear. 1972 GMC Pick-up Truck Ring and Pinion Set comes new OEM 1972 GMC Pick-up Truck Ring and Pinion Set aftermarket new 1972 GMC Pick-up Truck Ring and Pinion Set of remanufactured 1972 GMC Pick-up Truck Ring and Pinion Set C15/C1500 Pickup - Dana 60 - High Performance Replacement - 5.38 Gear Ratio - Thick - Rear.