Cummins ISX15 6 Cylinder Ultra Low Sulfur Diesel 400 hp Engine, 2014 US EPA Label, Air Conditioner, Cruise Control, 10-Speed Manual Transmission, 12000 lb Front Axle, 19000 lb Rears, SFOR02642392 Drive Axles, 3.58:1 Axle Ratio, 50000 lb GVWR, Air Ride Cab, steel, 275/80R22.5 Front Tires, 275/80R22.5 Rear Tires, Air Ride Suspension, 168 in Wheelbase, Air Sliding 5th Wheel