2015 Peterbilt 389. 550HP Cummins ISX15. 18 Speed Transmission. 4 Speed Auxiliary Transmission. 46,000LB Full Locking Rears. 20,000LB Air Lift Axle. 14,600LB Steer Axle. Only 446,000 Original Miles. Engine Overhaul Completed Less Than 65,000 Miles Ago. Double Framed. Air Trac Suspension. Steer Axle Disc Brakes. Loaded Interior. Leather Driver Seat. Gauge Package. Concert Class Stereo. Long Track Air Slide Fifth Wheel. 11R22.5 Drives. 315/80R22.5 Steers. Rear Fenders. Engine Brake. Cruise Control. Dual Breathers. Clean Peterbilt 389