Make: Peterbilt Year: 2015 Condition: New Unit 51427 (173299) listed by iSellPro, for sale by Peterbilt of Sioux City - SUMMER CLEARANCE : Price Reduced! 2 matched units available. Fridges, Espar Heater, Sunvisor, 1800W invertor, Shore Power, Fairings. 2015 PETERBILT 579 TANDEM AXLE SLEEPER FOR SALE IN IOWA :: - PETERBILT 579 for Sale Engine: CUMMINS ISX 450 HP Transmission: 13 Spd. Axles: Tandem Suspension: Pete Low Air Leaf Rear Ratio: 3.25