2015 GMC Yukon XL Ring and Pinion Set 4WD - GM 9.5 in. Rear - w/ 12 bolt cover - 3.73 Ratio - Ring and Pinion Set - 32 Spline Pinion - Fits 4 Series 3.42 & Up Carrier - Rear guaranteed to replace your current 2015 GMC Yukon XL Ring and Pinion Set 4WD - GM 9.5 in. Rear - w/ 12 bolt cover - 3.73 Ratio - Ring and Pinion Set - 32 Spline Pinion - Fits 4 Series 3.42 & Up Carrier - Rear. 2015 GMC Yukon XL Ring and Pinion Set comes new OEM 2015 GMC Yukon XL Ring and Pinion Set aftermarket new 2015 GMC Yukon XL Ring and Pinion Set of remanufactured 2015 GMC Yukon XL Ring and Pinion Set 4WD - GM 9.5 in. Rear - w/ 12 bolt cover - 3.73 Ratio - Ring and Pinion Set - 32 Spline Pinion - Fits 4 Series 3.42 & Up Carrier - Rear.