2017 Peterbilt 389, Cummins, ISX15, 550HP, Fuller 18 Speed Transmission, Sleeper, Stock # 650699 New Silver Peterbilt 389 Sleeper featuring a Cummins ISX 15 with 550HP and a Fuller 18 Speed Call a truck sales representative at Rush Truck Center Las Vegas to find out more about this beautiful silver 389 Finance options available.