Detroit DD13 12.8 L Engine, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller FOM-16E310C-LAS Automatic Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, Meritor RT-40-145A Drive Axles, 3.58:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, 11R22.5 Front Tires, 445/50R22.5 Super Singles Rear Tires, Air Ride Suspension, 188 in Wheelbase, Air Sliding 5th Wheel