Detroit Series 60 6 Cylinder 14.0 L Diesel 515 hp Engine, 2005 US EPA Label, Engine Brake, Eaton Fuller FRO-16210C 10-Speed Manual Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, Meritor RT-40-145 Drive Axles, 3.73:1 Axle Ratio, 52000.0 lb GVWR, Air Ride Cab, 72 in Flat Top Sleeper Cab, Aluminum Wheels, 11R24.5, Airliner Air Ride Suspension, 250 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks