2012 PETERBILT, 389Truck 18 Speed Transmission 63 Flat Top Sleeper 3.36 Rears *** AMERICAN CLASS INTERIOR ***Twin Leather Seats 11R 24.5 Virgin Rubber All Aluminum Wheels Low Air Leaf Suspension 3 Stage Jake Brake Air Slide 5th Wheel 1 Line 525 Horse Power, Pete Low Air Leaf Suspension, All Aluminum Wheels, 280 Wheel Base, , 40000 Rear Axle lbs, 3.36 Ratio, 63 Flat Top Sleeper.