2021 PETERBILT 579 Conventional, 80 Inch UltraLoft Sleeper, Upper Bunk, Cummins ISX15 Engine, 450 H.P., 10 Speed Transmission, (Automatic), 40,000 Lb. Rear Ends, 3.08 Ratio, Air Ride Suspension, Hydraulic Power Steering, Air Conditioned, Dual Aluminum Fuel Tanks, Horizontal Exhaust, Exterior Visor, Side Fairings, Cab Extenders, Quarter Fenders, Tilt And Telescoping Steering Wheel, Cruise Control, Power Windows, Air Slide 5th, 232 Inch Wheel Base, 22.5 Low Profile Tires, Aluminum Disc Wheels.