Cummins ISX15 6 Cylinder 15 L Diesel 550 hp Engine, 14989 Engine hrs, Engine Brake, Exhaust Brake, Eaton Fuller 18-Speed Manual Transmission, Triple Differential Locks, 16000 lb Front Axle, 40666 lb Rears, 44 in Sleeper Cab, Aluminum Wheels, 385/65R22.5 Front Tires, 11R24.5 Rear Tires, Double Frame, Air Ride Suspension, Wet Kit