The ALL-NEW Western Star 49X! This 2022 Western Star is powered by a Detroit DD16 560HP Engine, Detroit DT12 Vocational Transmission, 14,600lb Front Axle, 46,000lb Rear Axle, 230″ Wheel base, 120 Gallon RH 100 Gallon LH Fuel Tanks, Michelin Tires, 121″ Daycab.