Cat 3406 14.6 L Diesel Engine, Engine Brake, Eaton Fuller 15-Speed Manual Transmission, Differential Lock, 46000 lb Rears, 60 in Flat Top Sleeper Cab, Aluminum Wheels, 11R24.5, Air Ride Suspension, 231 in Wheelbase, PTO, Air Sliding 5th Wheel, Dual Fuel Tanks