Make: Peterbilt Year: 2015 Condition: New Unit 50126 (174710) listed by iSellPro, for sale by Peterbilt of Council Bluffs - Espar Heater,Fridg.,Leather Seats,TV and Inverter Prep. 2015 PETERBILT 579 TANDEM AXLE SLEEPER FOR SALE IN IOWA :: - Peterbilt 579 for Sale Engine: CUMMINS ISX ST 1 450 HP Transmission: 13 Spd. Axles: Tandem Suspension: Pete Low Air Leaf Rear Ratio: 3.25