Mack Trucks’ product portfolio has expanded with the introduction of two new rugged, robust tractors.
At a press event Monday in Las Vegas in advance of the 2026 ConExpo-Con/Agg show, Mack introduced Keystone, its brand-new purpose-built Class 8 vocational tractor, and reintroduced its heavily updated and redesigned Granite.
Designed to thrive in the most demanding on- and off-road environments, Mack states the new Keystone combines terrain versatility with the latest advancements in driver comfort, safety technology and Mack’s legendary durability.
The all-new Granite advances Mack’s vocational truck lineup too, the company says, delivering an all-new cab, cutting-edge safety technologies, enhanced driver comfort and industry-first features designed to set a new standard in the vocational segment.
“The Mack Keystone represents our commitment to providing customers in agriculture, construction and vocational markets with a truck that’s as capable on rough terrain as it is on the highway,” says Stephen Roy, president of Mack Trucks. “Named after the Keystone State of Pennsylvania, where all Mack Class 8 models for North America and export are assembled at Lehigh Valley Operations in Macungie, the Keystone continues Mack’s tradition of building rugged, reliable trucks that work as hard as the people who drive them.”
As for the Granite, Roy says it “embodies everything Mack stands for: legendary durability, uncompromising performance and a commitment to our customers who depend on these trucks to get the toughest jobs done. We’ve completely reimagined the Granite from the ground up, bringing the same level of innovation we delivered with our Pioneer and Anthem models to the vocational market.”
Keystone designed to succeed in tough applications
Mack says the Keystone is engineered for customers who operate in construction, agriculture, logging, livestock hauling and other applications that require a truck capable of performing on highways and challenging off-road terrain.
Key to this capability is the Keystone’s higher ground clearance, approach angle and robust suspension system. Mack states its available Maxride suspension is specifically engineered to deliver ultimate performance on the most demanding road conditions, providing best-in-class ride quality whether on highway or rough terrain.
Additionally, for the first time, Mack is offering this class of vocational tractor in both axle-forward and axle-back configurations, providing customers with greater flexibility to match their specific operational needs. The Keystone is available in three cab configurations: day cab, 44-in., sleeper and 64-in., sleeper, each offered in both axle positions. Rear axle configurations include 6x4, 8x4 and 8x6, the company states.
Mack adds the Keystone also builds on the strong legacy of the Pinnacle and delivers all the same advanced technology and safety as the Mack Pioneer, the all-new Mack Anthem and the updated Granite. The truck maker states this unified platform enables the Keystone model to offer identical comfort features, safety systems and performance technologies while maintaining the heavy-duty characteristics essential for vocational tractor applications.
“Our customers told us they wanted a truck that could handle the toughest jobs and job sites without compromising driver comfort or modern technology,” says Jonathan Randall, president of Mack Trucks North America. “The Keystone delivers exactly that: terrain versatility to navigate challenging road conditions, combined with the best ride quality in the business.”
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The Keystone is powered exclusively by the Mack MP 13 engine, delivering up to 540 horsepower and 1,950 lb.-ft., of torque to tackle the most demanding heavy-haul applications. Paired with the proven mDRIVE HD automated manual transmission, Mack states the Keystone delivers smooth, efficient power transfer in any terrain. The advanced powertrain delivers up to 6% improved fuel efficiency compared to the Pinnacle, helping customers reduce operating costs without sacrificing performance. The Keystone also offers the Mack Protect safety suite available on the Pioneer and Anthem.
Finally, to maximize uptime, Mack states the Keystone comes standard with the company’s integrated uptime solutions, including a complimentary five-year subscription to Mack Connect, Mack’s telematics platform that provides real-time vehicle monitoring, remote diagnostics and proactive service scheduling to keep trucks on the road and productive.
In addition to North American markets, the Keystone will be available in select international markets, marking the first time Mack has offered this class of vocational tractor in Latin America. The Mack Keystone will be available for order through Mack’s dealer network late in the third quarter.
“The Keystone is designed for terrain versatility; it thrives where the roads are unpaved, uneven or even nonexistent, then transitions seamlessly to highway driving,” says Fernando Couceiro, Mack Trucks’ vice president of highway trucks. “Whether you’re hauling logs out of a forest, delivering heavy equipment to a construction site or transporting agricultural goods across rural roads, the Keystone is built to handle it all.”
The safety-focused, performance-built all-new Granite
Mack says the all-new Granite sets a new standard for safety in the vocational segment, introducing multiple industry-first technologies that bring advanced protection to demanding work environments.
The available Mack Protect safety suite, the same system available on the all-new Mack Pioneer and all-new Mack Anthem, includes front camera, front radar and 270-degree radar coverage with both passenger-side and driver-side radar systems. Having both driver-side (left-hand) and passenger-side (right-hand) radars is a first for the vocational segment, the company says.
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The Granite is also the first vocational truck to feature an Electronic Park Brake (ePark Brake) with rollaway protection in conjunction with auto release when shifting into gear. Additional safety features include standard front and available side-curtain airbags, standard LED headlamps and fog lamps with available cornering lights. Standard on every all-new Granite is E911 auto-call, which automatically contacts emergency services when in cellular service range, if an airbag deploys or the system detects a rollover or collision, another first for the vocational segment.
Mack adds an optional proprietary camera system provides up to five camera inputs, including backup camera and downward-facing passenger-side camera for enhanced visibility of certain blind spots, particularly useful for certain customers in urban operations. An optional Digital Mirror System is also available.
“We’re bringing safety technologies to the North American vocational market that have never been available before,” said Alex Lee, Mack Trucks senior product manager for vocational and medium duty. “Features like the ePark Brake, 270-degree radar coverage and E911 auto-call are going to make a real difference in protecting drivers who work in some of the most challenging environments.”
The Granite features the new Mack MP 13 engine, delivering greater power, up to 540 HP and 1,950 lb.-ft., of torque, while providing up to 3% improved fuel efficiency compared with the previous engine. Mack adds the updated Mack mDRIVE automated manual transmission, available in 12-, 13- and 14-speed configurations, provides 30% faster shifts for improved responsiveness and shift quality. The 13-speed features a low reduction creeper gear for improved startability on steep grades and with heavy loads. The 14-speed features a 32:1 ultra-low-speed reduction gear ideal for precision work like curb pouring and loose soil conditions. The Granite also offers a Cummins X10 engine, rated from 350-450 HP and 1,250-1,650 lb.-ft., of torque, with an Allison automatic transmission.
The Granite also continues Mack’s legacy of durability through its legendary axles with the new MaxRide air load distributing suspension, a non-torque reactive eight-bag system proprietary to Mack that delivers superior ride quality and load management, the company states.
“Ride quality matters in vocational applications; our customers are navigating job sites, rough terrain and city streets all in the same day,” says Tim Wrinkle, vice president, product owner, vocational and medium duty at Mack. “The Granite’s MaxRide air suspension delivers a smoother, more comfortable ride that helps reduce driver fatigue and keeps drivers performing at their best.”
The all-new Granite also introduces the latest generation BodyLink IV, which Mack states features a completely redesigned electrical architecture enabling new customizable logic and diagnostics. The system supports flexible switches and system controllers that can be programmed enabling virtual interlocks and automations to improve upfit, productivity and safety.
The all-new Mack Granite will be available in day cab and 44-in., sleeper configurations in both axle-forward and axle-back positions, with multiple front and rear axle ratings to handle specific customer requirements. The new Granite will be available for order in the latter half of 2026 with production to begin in January 2027,
