Part Notes: All Models; Right; 1/2 TON; With Silverado, Sierra; Extended Cab; 3.42 Axle Ratio;All Models; Right; 1/2 TON; With Silverado, Sierra; Extended Cab; 4.10 Axle Ratio; Without 6.0L;All Models; Right; 1/2 TON; With Silverado, Sierra; Standard Cab