2012 GMC Sierra Ring and Pinion Set Sierra 2500 HD - 4WD - GM 10.5 in Rear - w/ 14 Bolt Cover - 5.38 Ratio - Thick Ring and Pinion Set - Fits 3 series 4.10 & Down Carrier - Rear guaranteed to replace your current 2012 GMC Sierra Ring and Pinion Set Sierra 2500 HD - 4WD - GM 10.5 in Rear - w/ 14 Bolt Cover - 5.38 Ratio - Thick Ring and Pinion Set - Fits 3 series 4.10 & Down Carrier - Rear. 2012 GMC Sierra Ring and Pinion Set comes new OEM 2012 GMC Sierra Ring and Pinion Set aftermarket new 2012 GMC Sierra Ring and Pinion Set of remanufactured 2012 GMC Sierra Ring and Pinion Set Sierra 2500 HD - 4WD - GM 10.5 in Rear - w/ 14 Bolt Cover - 5.38 Ratio - Thick Ring and Pinion Set - Fits 3 series 4.10 & Down Carrier - Rear.