2015 MACK, PINNACLE CHU613, Heavy Duty Trucks - Day Cab Trucks, MACK MP8, AMT, HEAVY SPEC!!!!!! 2015 used, BLUE Mack CHU613 Day Cab Tractor. Holds an MP8 engine with 445 Horse Power. Has an automated, 12 speed, M-Drive transmission. Front axle holds 13,200 pounds, and rear axle holds 46,000 pounds. Has a tandem axle with air ride suspension. Plus a rear ratio of 3.21 and a wheelbase of 202., 445 Horse Power, Air Ride Suspension, Aluminum Wheels, 202 Wheel Base, 22.5LP, Axle, 3.21 Ratio, , VIN 1M1AN07Y8FM020368