2020 Peterbilt 389, Cummins Engine, X15 Model, 600 Horsepower, 18sp Manual Transmission, 3.73 Ratio, 266 Wheelbase, 20,000lb Fronts, 22,000lb Pusher, 46,000lb Rears, Lockers, 63" Standup Sleeper, Air Trac Suspension, Rear Fenders (White Plastic). Trucks Comes with Overhaul Paperwork Through CUMMINS. 34,989 Miles on Overhaul Located in Bismarck, ND Call for More Information.