1980 GMC Pick-up Truck Ring and Pinion Set K3500 - 4WD - Dana 70 Rear - Thick Ring and Pinion Set - 4.56 Ratio - 5/8 in. Offset - 29 Spline Pinion - Fits 3 Series 4.10 & Down Carrier - Rear guaranteed to replace your current 1980 GMC Pick-up Truck Ring and Pinion Set K3500 - 4WD - Dana 70 Rear - Thick Ring and Pinion Set - 4.56 Ratio - 5/8 in. Offset - 29 Spline Pinion - Fits 3 Series 4.10 & Down Carrier - Rear. 1980 GMC Pick-up Truck Ring and Pinion Set comes new OEM 1980 GMC Pick-up Truck Ring and Pinion Set aftermarket new 1980 GMC Pick-up Truck Ring and Pinion Set of remanufactured 1980 GMC Pick-up Truck Ring and Pinion Set K3500 - 4WD - Dana 70 Rear - Thick Ring and Pinion Set - 4.56 Ratio - 5/8 in. Offset - 29 Spline Pinion - Fits 3 Series 4.10 & Down Carrier - Rear.