Tuff Country 01-08 Chevy Silverado 2500HD 4wd Traction Bars PairTuff Country traction bars help to reduce axle hop or wrap, providing increased traction and acceleration for vehicles with larger than stock tires. Designed to mount one end to the u bolt plate and the other to the vehicle's frame. This Part Fits: Year Make Model Submodel 2001 2005 Chevrolet Silverado 2500 HD Base 2001 2006 Chevrolet Silverado 2500 HD LS 2001 2006,2008 Chevrolet Silverado 2500 HD LT 2008 Chevrolet Silverado 2500 HD LTZ 2003 2006,2008