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.

Mack Trucks has expanded its MD Series line with a new 23,000-lb. rear axle offering and a 325 hp engine rating. Mack says ...