USA Standard ring and pinion sets are the right choice to add confidence to your install. USA Standard Gear offers a full line of ring and pinion sets for a variety of common and hard to find applications. Fits GM 9.25 inch front 9.25 inch ring gear 30 Spline Pinion 12 ring gear bolts 4.11 ratio 1 year warranty against Manufacturer defects Features and Benefits: Fits GM 9.25 Inch front 9.25 Inch ring gear 30 spline pinion 12 ring gear bolts 4.11 ratio Details: AAP_UDA_4: 70 Fitment Notes: GM 9.25 inch. IFS Reverse Rotation 4.11 Ratio Application Summary: 2007 Chevrolet Silverado 3500 Classic (Front) (Drive: 4WD) 2007 Chevrolet Silverado 1500 HD Classic (Front) (Drive: 4WD) 2002-2006 Chevrolet Avalanche 2500 (Front) 1988-2000 Chevrolet K2500 (Front) 1992-1999 Chevrolet K2500 Suburban (Front) 1989-2000 Chevrolet K3500 (Front) 2001-2006 Chevrolet Silverado 1500 HD (Front) (Drive: 4WD) 1999-2004 Chevrolet Silverado 2500 (Front) (Drive: 4WD) 2001-2015 Chevrolet Silverado 2500 HD (Front) (Drive: 4WD) 2001-2006 Chevrolet Silverado 3500 (Front) (Drive: 4WD) 2000-2013 Chevrolet Suburban 2500 (Front) (Drive: 4WD) 1988 Chevrolet V20 Suburban (Front) 1989-1991 Chevrolet V2500 Suburban (Front) 2007-2015 Chevrolet Silverado 3500 HD (Front) (Drive: 4WD) 2007 GMC Sierra 2500 HD Classic (Front) (Drive: 4WD) 2007 GMC Sierra 3500 Classic (Front) (Drive: 4WD) 2007 GMC Sierra 1500 HD Classic (Front) (Drive: 4WD) 1988-2000 GMC K2500 (Front) 1992-1999 GMC K2500 Suburban (Front) 1988-2000 GMC K3500 (Front) 2000-2013 GMC Sierra 1500 (Front) (Drive: 4WD) 2001-2006 GMC Sierra 1500 HD (Front) (Drive: 4WD) 1999-2004 GMC Sierra 2500 (Front) (Drive: 4WD) 2001-2015 GMC Sierra 2500 HD (Front) (Drive: 4WD) 2001-2006 GMC Sierra 3500 (Front) (Drive: 4WD) 2000-2013 GMC Yukon XL 2500 (Front) (Drive: 4WD) 2007-2015 GMC Sierra 3500 HD (Front) (Drive: 4WD) 2003-2009 Hummer H2 (Front) (Drive: 4WD)