Eaton Detroit Truetrac Differential 28 Spline 1.20in Axle Shaft Diameter All Gear Ratios Rear 8inThe Detroit Truetrac is a helical gear style, limited slip differential that maximizes wheel traction and enhances driving characteristics. Maintenance free, it features smooth, automatic operation in forward and reverse. Its versatility makes Detroit Truetrac the ideal traction solution for almost any type of vehicle. This Part Fits: Year Make Model Submodel 2002 2005 Chevrolet Silverado 1500 Base 2004 2006,2009 2010 Chevrolet Silverado 1500 Hybrid