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OEM Replacement Stock GM 8.6 inch, 3.73 ratio, anti-spin differential2007-2008 Chevrolet Suburban 1500, 2007-2008 GMC Yukon, 2007-2008 Chevrolet Tahoe, 2007-2008 Chevrolet Avalanche, 2007-2008 GMC Yukon XL 1500