Mack Trucks adds 23,000-lb. rear axle, 325 hp engine rating for MD Series

Mack Trucks now offers a 23,000-lb. 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 lbs., the heavier axle and suspension offer increased capability for hauling heavy loads. The Mack MD with the 23,000-lb. rear axle specifically benefits refuse packers with 11-yard up to 20-yard rear loaders, as well as those Mack MD models being utilized as water trucks holding 2,000 to 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 23,000-pound rear axle expands the applications in the vocational market – with refuse and construction reaping the most benefits,” said Tim Wrinkle, Mack vice president of vocational and medium duty. “The 325 horsepower also offers carriers traversing longer routes or in a hilly or mountainous region a more durable and reliable powertrain.”

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). And 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 4x2 configurations, the MD6 and MD7 models feature a sharp wheel cut for enhanced maneuverability for tough urban settings. The MD Series cab was updated in January to a larger cab with bumper-to-back-of-cab (BBC) measurement of 107” providing industry-leading comfort.

The interior boasts satin aluminum trim, improved seating with lumbar support, and enhanced LED lighting. New steering wheel controls for cruise control, telephone, and audio functions have been added, increasing driver convenience and safety. All of these have been popular with Mack’s Class 8 customers.

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

Pre-wired body builder connections relocated air dryer and updated wheelbases to industry-standard Cab to Axle (CA) dimensions make the updated MD Series easier to install an even wider array of body installations than previously.