2013 GMC Savana 1500 Ring and Pinion Set RWD - w/ 3.90 Axle Ratio - GM 8.5 & 8.6 in. - 10 Bolt - Ring and Pinion Set - 3.90 Ratio - Rear guaranteed to replace your current 2013 GMC Savana 1500 Ring and Pinion Set RWD - w/ 3.90 Axle Ratio - GM 8.5 & 8.6 in. - 10 Bolt - Ring and Pinion Set - 3.90 Ratio - Rear. 2013 GMC Savana 1500 Ring and Pinion Set comes new OEM 2013 GMC Savana 1500 Ring and Pinion Set aftermarket new 2013 GMC Savana 1500 Ring and Pinion Set of remanufactured 2013 GMC Savana 1500 Ring and Pinion Set RWD - w/ 3.90 Axle Ratio - GM 8.5 & 8.6 in. - 10 Bolt - Ring and Pinion Set - 3.90 Ratio - Rear.