Volvo D13J425 6 Cylinder 12.9L Diesel 425 HP Engine (will advance to 505HP), 12821 Engine Hrs, Volvo ATO261D 12-Speed Automated Transmission 12350 lb FA, 40000 Rears, Meritor MT-40-14X Drive Axles, 3.25:1 Axle Ratio, 52350 GVWR, Air Ride Cab, Aluminum Wheels, Virgin Rubber, 11R22.5, Air Ride Suspension, 178 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks, Cruise, A/C, Stereo, and Tilt.