Cummins N14 6 Cylinder Diesel 460 hp Engine, 2000 US EPA Label, Eaton Fuller RTLO-16918B 18-Speed Manual Transmission, 12000 lb Front Axle, 40000 lb Rears, Spicer DSS40P Drive Axles, 4.33:1 Axle Ratio, Air Ride Cab, Aluminum Front Wheels, 11R22.5 Front Tires, 11R22.5 Rear Tires, Airliner Air Ride Suspension, 176 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks