2021 Peterbilt 579, PACCAR, MX-13, 455HP, PACCAR 12 Speed Autoshift Transmission, Day Cab, , , Stock # 1224091 2021 Peterbilt 579. Paccar MX-13 455 HP. 462,771 miles. Paccar 12 speed Endurant Transmission Automatic. Unit is ready to work. PM completed, DOT inspected, and DPF cleaned. Price does not include state and local taxes; tags; registration or title fees; dealer-imposed fees, including document preparation, processing or servicing fees, or any optional equipment or upfitting work selected by buyer. Valid while supplies last. Images shown may not reflect actual vehicle.