Since 1900, the Mack brand has been part of American culture, helping build some of the country’s most significant landmarks.

Mack is now offering a 23,000-pound rear axle and Cummins B6.7 engine with up to 325 horsepower on its Mack MD Series models. Designed for a Gross Axle Weight Rating (GAWR) of up to 23,000 pounds ...

When paired with the 325 hp engine rating and the Allison 3000RDS transmission, the Mack MD is now capable of increased ...

A new 23,000-lb. rear axle and 325-horsepower engine rating boost durability and performance for vocational customers.

In 1917, the British government bought the company’s Mack AC model to place on the battlefield ... the company also has developed durable engines and an unmatched driver experience.