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OEM Replacement GM 11.5 inch, 4.10 ratio, Anti-spin differentialDual Wheel And Chassis Cab Applications, This Will Not Fit Pickup Applicatiions2011-2014 Chevrolet Silverado 3500 HD, 2011-2014 GMC Sierra 3500 HD, 2011-2013 Chevrolet Silverado 3500 Chassis Cab with wide track