Volvo D13 500 HP Eco-Torque Engine, Volvo ATO2612D 12-Speed Auto Trans, Engine Brake, Diesel Dual Alum Tanks 250 Gal. Total, Single Exhaust, Rear Meritor 3.08, Axles Tandem 12,350 Front / 38,000 Rear GVWR (lbs) 50,350, Steel Frame, Air Ride, Wheelbase 212, Tire Size - F: 295/75R22.5 Tire Size - R: 295/75R22.5, Aluminum Wheels, 5th Wheel Air Slide, A/C, 61 Sleeper with Dual Bunks Mileage: 631,562/631,562 ECM, Engine Hours: 15275.