2021 Peterbilt 579 – Clean Day Cab Performance This 2021 Peterbilt 579 is powered by the dependable Cummins X15 rated at 400HP and paired with a smooth Eaton Fuller 12-speed Endurant for efficient, driver-friendly operation. Configured as a day cab, this unit is ideal for regional haul, dedicated routes, and fleet applications requiring reliable Class 8 performance. Stock #1442192 Ready to go to work. 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.