Fits 11.50 Rear Axle, 4.10 Rear Axle Ratio, Anti-Spin Differential Rear Axle; Regular Cab; 8 Foot Bed; Med. Duty 2WD or 11.50 Rear Axle, 4.10 Rear Axle Ratio, Anti-Spin Differential Rear Axle; Mega Cab or 11.50 Rear Axle, 4.10 Rear Axle Ratio, Anti-Spin Differential Rear Axle; Crew Cab; 8' Box; Med. Duty 2WD

11.50 Rear Axle, 4.10 Rear Axle Ratio, Anti-Spin Differential Rear Axle; Crew Cab; 6'4" Box; Med. Duty 2WD

11.50" Dual Wheels Rear Axle, 4.10 Rear Axle Ratio, Anti-Spin Differential Rear Axle; Exc. Auto Level Rear Air Suspension; Crew Cab; 6'4" Box; HD 4WD

Fits 11.50" Dual Wheels Rear Axle, 4.10 Rear Axle Ratio, Anti-Spin Differential Rear Axle; Exc. Auto Level Rear Air Suspension; Mega Cab; HD 4WD or 11.50" Dual Wheels Rear Axle, 4.10 Rear Axle Ratio, Anti-Spin Differential Rear Axle; Exc. Auto Level Rear Air Suspension; Crew Cab; 6'4" Box; HD 4WD