For Sale: 2021 Peterbilt 579 Day Cab – Cummins X15 Power, Clean and Ready to Work This 2021 Peterbilt 579 Day Cab delivers a strong combination of performance, efficiency, and reliability. Powered by a Cummins X15 engine producing 400 HP and paired with an Eaton Fuller 12-Speed Endurant automated transmission, this truck is built for linehaul, regional, or heavy-duty applications. With a 52,000 lb GVWR and a 2.79 rear axle ratio, it’s optimized for both pulling power and fuel economy. The truck is equipped with an AirSlide fifth wheel, making trailer connections quick and easy. Key Specs: Engine: Cummins X15 – 400 HP Transmission: Eaton Fuller 12-Speed Endurant Automated Cab: Day Cab GVWR: 52,000 lbs Wheelbase: 186" Fifth Wheel: AirSlide Rear Axle Ratio: 2.79 Mileage: 554,289 miles Stock #: 1418225 Fleet-maintained and clean inside and out, this truck is ready for immediate service. Whether for regional hauls or local freight, it offers the durability and efficiency you expect from Peterbilt. Call today for pricing, availability, and financing options!