Cummins 6 Cylinder Diesel Engine, Engine Brake, Eaton Fuller FRO-16210C 10-Speed Manual Transmission, 12500 lb Front Axle, 40000 lb Rears, Meritor MT-40-14X Drive Axles, 3.42:1 Axle Ratio, 52500 lb GVWR, Air Ride Cab, 42 in High Rise Sleeper Cab, Bunk Beds, 285/75R24.5, Air Ride Suspension, 225 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks