Cummins ISX15 14.9 L Diesel 450 hp Engine, 2011 US EPA Label, Requires Diesel Exhaust Fluid, 28807 Engine hrs, Engine Brake, Eaton Fuller RTLO-16918B 18-Speed Manual Transmission, Double Differential Locks, 14320 lb Front Axle, 46000 lb Rears, Dana D46-170HP Drive Axles, 3.91:1 Axle Ratio, 60320.0 lb GVWR, Aluminum Front Wheels, 11R24.5, Steerable Air Lift Pusher Axle, AG400 8-Bag Air Ride Suspension, 235 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks