Part Notes: Silverado, Sierra; 2WD; 3/4; Crew Cab; 143" Wheelbase; Auto Trans; 4l80e;Silverado, Sierra; 2WD; 3/4; Crew Cab; 143" Wheelbase; Auto Trans; Allison 5 Speed;Silverado, Sierra; 2WD; 3/4; Crew Cab; 143" Wheelbase; Manual Trans;Silverado, Sierra; 2WD; 3/4; Crew Cab; 167" Wheelbase;Silverado, Sierra; 2WD; 3/4; Extended Cab; 143" Wheelbase; All;Silverado, Sierra; 2WD; 3/4; Extended Cab; 157" Wheelbase; Auto Trans; Allison 5 Speed;Silverado, Sierra; 2WD; 3/4; Extended Cab; 157" Wheelbase; Manual Trans; 6 Speed Manual;Silverado, Sierra; 4WD; 3/4 Ton; Crew Cab; 143" Wheelbase;Silverado, Sierra; 4WD; 3/4 Ton; Crew Cab; 167" Wheelbase