Cummins X15 400ST 6 Cylinder 15 L Diesel 400 hp Engine, 2021 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller EEO 16F112C 12-Speed Automated Transmission, 12000 lb Front Axle, 38000 lb Rears, Meritor MT-40-14X Drive Axles, 3.08:1 Axle Ratio, 50000.0 lb GVWR, Air Ride Cab, Aluminum Front Wheels, Air Ride Suspension, Air Sliding 5th Wheel, Dual Fuel Tanks