The 2021 Mack Granite dump truck is a robust and reliable vehicle designed for hauling heavy loads in various conditions. Here are its key specifications and features based on the provided information:

Engine:
Powered by a Mack MP7 six-cylinder diesel engine with a displacement of 10.9 liters.
Equipped with an engine brake for improved control and safety during descents.

Transmission:
Fitted with a Maxitorque ES manual transmission offering 13 speeds.

Chassis:
Features tandem axles for enhanced load-bearing capacity.
Equipped with inter-axle differential lock for improved traction.
Utilizes Camelback suspension for stability and smooth ride quality.
Braking system includes air brakes for reliable stopping power.

PTO:
Equipped with a power take-off (PTO) system.

GVWR and Axle Ratings:
Gross Vehicle Weight Rating (GVWR) is 62,000 lbs.
Front Axle Weight Rating (FAWR): 18,000 lbs.
Inter-Axle Weight Rating (IAWR): 22,000 lbs.
Rear Axle Weight Rating (RAWR): 22,000 lbs.

Interior:
Features an air-conditioned (AC) and heated interior for operator comfort.
Includes heated mirrors, power windows, and cruise control for convenience during operation.

Dump Bed:
Installed with an Ox Bodies Inc 1677 dump bed.
Offers a capacity of 17 cubic yards.
The bed dimensions are 16 feet in length and 96 inches in width.
Side height of the bed is 48 inches.
Equipped with a roll tarp for covering the load.
Features a single ram for lifting and an air-operated high-lift end gate for efficient unloading.

Tires:
Front tires: 425/65R22.5
Rear tires: 11R24.5