Sharp! 2020 Peterbilt 579 Day Cab with a Strong 455hp MX13 Engine; 12 Speed Automatic Transmission; Vertical Exhaust; Hood Mirrors; Air Slide 5th Wheel; Stainless Steel Front Bumper and Front Disc Brakes. This 2020 Peterbilt 579 is coming as a JX Certified Unit meaning it is going through a rigorous 180 Point Dealer Inspection that also includes a DOT Inspection as well as a FULL PM SERVICE! Vehicle specifications; options; mileage; and availability are subject to change. While every effort is made to ensure accuracy all information should be verified with a sales professional prior to purchase.