Cummins ISX 6 Cylinder 11.9 L Ultra Low Sulfur Diesel 425 hp Engine, 2015 US EPA Label, Requires Diesel Exhaust Fluid, Positive Air Shutoff, Air Conditioner, Cruise Control, Engine Brake, Eaton Fuller FRO-16210C 10-Speed Manual Transmission, Differential Lock, 20000 lb Front Axle, 44000 lb Rears, 4.63:1 Axle Ratio, 64000 lb GVWR, 425/65R22.5 Front Tires, 11R22.5 Rear Tires, Dual Steering Boxes, Air Ride Suspension, 243 in Wheelbase, Headache Rack, Air Sliding 5th Wheel