Fits Cab Chassis; 3.42 Rear Axle Ratio; 11.50 Rear Axle; Anti-Spin Differential Rear Axle; Regular Cab Chassis; HD 4WD or Cab Chassis; 3.42 Rear Axle Ratio; 11.50 Rear Axle; Anti-Spin Differential Rear Axle; Regular Cab Chassis; HD 2WD or Cab Chassis; 3.42 Rear Axle Ratio; 11.50, Dual Wheels Rear Axle; Anti-Spin Differential Rear Axle; Regular Cab Chassis; HD 2WD or Cab Chassis; 3.42 Rear Axle Ratio; 11.50, Dual Wheels Rear Axle; Anti-Spin Differential Rear Axle; Crew Cab; 173.4" Wheelbase; HD 4WD or 3.42 Rear Axle Ratio; 11.50 Rear Axle; Anti-Spin Differential Rear Axle; Exc. Auto Level Rear Air Suspension; Mega Cab; HD 4WD or Cab Chassis; 3.42 Rear Axle Ratio; 11.50, Dual Wheels Rear Axle; Anti-Spin Differential Rear Axle; Crew Cab; 173.4" Wheelbase; HD 2WD or 3.42 Rear Axle Ratio, Auto Level Rear Air Suspension; 11.50 Rear Axle; Anti-Spin Differential Rear Axle; Mega Cab; HD 2WD or 3.42 Rear Axle Ratio, Auto Level Rear Air Suspension, aluminum Rear Axle Differential Cover; 11.50, Dual Wheels Rear Axle; Anti-Spin Differential Rear Axle; Mega Cab; HD 2WD or 3.42 Rear Axle Ratio, Auto Level Rear Air Suspension; 11.50 Rear Axle; Anti-Spin Differential Rear Axle; Crew Cab; 6'4" Box; HD 2WD or 11.50, Dual Wheels Rear Axle; 3.42 Rear Axle Ratio; Anti-Spin Differential Rear Axle; Exc. Auto Level Rear Air Suspension Or aluminum Rear Axle Differential Cover; Crew Cab; 6'4" Box; HD 2WD or 3.42 Rear Axle Ratio, Auto Level Rear Air Suspension, aluminum Rear Axle Differential Cover; 11.50, Dual Wheels Rear Axle; Anti-Spin Differential Rear Axle; Crew Cab; 6'4" Box; HD 2WD or 3.42 Rear Axle Ratio, Auto Level Rear Air Suspension; 11.50 Rear Axle; Anti-Spin Differential Rear Axle; Crew Cab; 8' Box; HD 4WD or 3.42 Rear Axle Ratio, Auto Level Rear Air Suspension; 11.50 Rear Axle; Anti-Spin Differential Rear Axle; Crew Cab; 8' Box; HD 2WD