Cummins X15 6 Cylinder 15.0 L Diesel Engine, Engine Brake, Eaton Fuller RTLO-18918B 18-Speed Manual Transmission, Double Differential Locks, 13300 lb Front Axle, 46000 lb Rears, Meritor Drive Axles, 3.73:1 Axle Ratio, 59300 lb GVWR, Air Ride Cab, 60 in High Rise Sleeper Cab, Aluminum Wheels, 11R24.5 Front Tires, 11R24.5 Rear Tires, Air Ride Suspension, 240 in Wheelbase, Air Sliding 5th Wheel, Headache Rack, Lowboy Ramps, Dual Fuel Tanks