Cummins ISX-15 450 Engine, Eaton Fuller FRO-1621C 10-Sped Transmission, Axles - Front: 12,500 lb / Rear: 40,000 lb. Meritor MT40-14X, Rear Ratio: 2.47, Dual Aluminum Fuel Tanks, 61 Mid-Roof Condo Sleeper, Extenders and Fairings, Single Stack, Steel Wheels, Tires: 295/75R22.5G, 381,451 miles