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.

The Mack MD with the 23,000-lb. rear axle benefits refuse packers with 11-yard up to 20-yard rear loaders, as well as those Mack MD models being used as water trucks holding ...

And Mack says the combination of beefier rear axle with 325-hp engine and Allison 3000RDS transmission are capable of increasing towing capacity if the truck is pulling a trailer. “The 23,000-lb. rear ...