Mack Trucks Announces New Rear Axle and Engine for MD Series

Mack Trucks has revealed that it now offers a new rear axle and engine for its Mack MD Series models. These additions will help the company expand its capabilities. 

The new engine being offered is a Cummins B6.7 with up to 325 hp. The new rear axle is designed for a Gross Axle Weight Rating (GAWR) of up to 23,000 lbs. The heavier axle and suspension offer increased capability for hauling loads requiring durable trucks. The Mack MD with the 23,000-lb. rear axle specifically benefits refuse packers with 11-20 yard rear loaders, as well as those Mack MD models being utilized as water trucks holding 2,000-2,500 gallons of water.

When paired with the 325 hp engine rating and the Allison 3000RDS transmission, the Mack MD is now capable of increased towing capacity if the customer has a trailer. 

“The 325 hp also offers carriers traversing longer routes or in a hilly or mountainous region a more durable and reliable powertrain. The rear axles on those truck models equipped with a dump body, hook lift, or roll-offs take some abuse during the truck’s lifespan. The heavier axle rating has better durability, and the larger horsepower engine will provide enhanced performance,” said Tim Wrinkle, vice president of vocational and medium duty at Mack Trucks. 

The Mack MD6, a Class 6 model, has a Gross Vehicle Weight Rating (GVWR) of 25,995 lbs., and the MD7, a Class 7 model, has a GVWR of 33,000 lbs. Both models are exempt from the 12% Federal Excise Tax (FET).

The Mack MD Series models meet the needs of trucking applications requiring dry van/refrigerated, stake/flatbed, dump, and tank truck vocations. The MD6 model does not require a Commercial Driver’s License (CDL) to operate for non-hazardous payloads.

The Mack MD Series is an all-new model range built specifically for medium-duty applications. Available in 4×2 configurations, the MD6 and MD7 models feature a sharp wheel cut for improved maneuverability in tough urban settings. 

The trucks now come standard with several improved safety features including new ABS (Anti-Lock Braking System) with ATC (Automatic Traction Control), radio mute in reverse, and a park brake alarm.