Mack Unveils New Granite and Keystone Vocational Trucks at CONEXPO

March 4, 2026

Matt Wolfe

The all-new Mack Granite and Keystone will be available for order through Mack’s dealer network later this year. (Mack)

Mack has gone all in on vocational trucks, revealing two brand new models ahead of CONEXPO 2026 in Las Vegas. The new Mack Granite and Keystone made their first public appearance during Mack’s launch party at the Las Vegas Motor Speedway.

SAE Media was in attendance for the launch of the Granite and Keystone models, which bring a new cab, the latest safety technologies, enhanced driver comfort and other features. According to Mack, these trucks were designed set a new standard in the vocational segment.

“The all-new Mack Granite 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,” said Stephen Roy, president, Mack Trucks. “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.

The Grante comes standard with a full array of modern safety features as well as an electronic parking brake. (Mack)

“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. Named after the Keystone State of Pennsylvania, where all Mack Class 8 models 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.”

Safety first

The Granite is a notable step up in terms of ADAS and other safety-related tech. It can be equipped with Mack Protect, the same system currently available on the outgoing Pioneer and Anthem models. It includes a front camera, front radar and 270-degree radar coverage with both passenger- and driver-side radar systems.

According to Mack, driver- and passenger-side radar is a first for the vocational segment.

Mack’s E911 auto-call system is also standard equipment on the Granite. This system automatically contacts emergency services if an airbag deploys or detects a rollover or collision. Mack also claims that the Granite is the first vocational truck to feature an electronic parking brake. The system offers rollaway protection in conjunction with auto release when shifting into gear.

Additional safety features include standard front and available side-curtain airbags as well as LED headlamps and fog lamps with available cornering lights. 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. A digital mirror system is also available.

Both the Granite and Keystone come standard with Mack’s digital gauge cluster. (Mack)

Power and control

Granites with the largest power needs will be motivated by the Mack MP 13 engine, which can deliver up to 540 hp (403 kW) and 1,950 lb-ft(2,644 Nm) while providing a claimed 3% improvement in fuel economy. The MP13 will be bolted to an updated Mack mDRIVE automated manual transmission, available in 12-, 13- and 14-speed configurations. Granite can also be fitted with the Cummins X10 HELM engine with power ratings of 350-450 hp (261-336 kW) and 1,250-1,650 lb-ft (Nm). X10-powered Granites will be backed by an Allison automatic transmission.

Mack’s latest mDRIVE gearbox provides 30% faster shifts for improved responsiveness and shift quality. The 13-speed variant 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 for precision work like curb pouring and loose soil conditions.

Also new for the Granite is Mack’s MaxRide air load distributing suspension. The system is a non-torque reactive eight-bag system that, according to Mack, delivers superior ride quality and load management.

Following the presentation of the Granite and Keystone, Mack held a reception for media, dealers and customers to put their hands on the new trucks. (SAE Media)

“Ride quality matters in vocational applications; our customers are navigating job sites, rough terrain and city streets all in the same day,” said 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.”

Body building

The Granite will be available in both day cab and 44-inch (111 cm) sleeper configurations in both axle-forward and axle-back positions with multiple front and rear axle ratings to meet customer requirements.

The construction of the Granite’s cab is an all-new galvanized steel design that is significantly larger than its predecessor, with nine inches (22 cm) of additional width at the B-pillar for increased interior volume and driver comfort.

The windshield of the Granite is also new. Mack’s Impact Shield is a one-piece, bonded, curved windshield that is designed to provide improved durability and impact resistance. The Granite’s shorter 113.5-inch (288 cm) bumper-to-back-of-cab dimension in both axle-forward and axle-back configurations simplifies bodybuilder adaptation and ensures compliance with regulatory requirements across all markets.

Mack had several variants of the Grante and Keystone on display during their launch party. (SAE Media)

The Granite also introduces Mack’s BodyLink IV electrical system, featuring 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 system enables extensive prewiring of accessories, flexible connections, programmable switches and intuitive tools to help improve quality, enable key safety features, allow for quicker installation and reduce overall production cost.

“BodyLink IV is designed to make body installation simpler, safer and faster for body builders and fleet technicians,” Wrinkle said. “When our customers save time, they save money, so knowing this we engineered this enhanced system.”

Mack claims that BodyLink IV’s expanded capabilities mean that most vocational applications can be precisely configured thanks to dedicated power and signal connectors that minimize wiring complexity and maximize installation quality.

“BodyLink IV offers more flexibility and deeper control,” said Alex Lee, Mack senior product manager for vocational and medium duty. “Technicians can quickly check and customize settings, set up custom safety parameters and create templates that keep every truck in a fleet consistent. It’s easy to use and built to keep trucks reliably working.”

BodyLink IV includes dedicated power and signal connectors, programmable connector pinouts, two-way communication through BB-CAN and customizable body information in the instrument cluster.

Like a stone

The Keystone replaces the Pinnacle in Mack’s lineup after a two-decade production run and features the same suite of safety tech as its Granite platform mate. The unified platform also enables Keystone to offer identical comfort features and performance technologies as the Granite, such as the Maxride air suspension.

“Our customers told us they wanted a truck that could handle the toughest jobs and job sites without compromising driver comfort or modern technology,” Jonathan Randall, president of Mack Trucks North America, said. “The Keystone delivers exactly that: terrain versatility to navigate challenging road conditions, combined with the best ride quality in the business.”

The Keystone is principally intended for construction, agriculture, logging and livestock applications. “The Keystone is designed for terrain versatility; it thrives where the roads are unpaved, uneven or even nonexistent, then transitions seamlessly to highway driving,” said Fernando Couceiro, 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 Keystone is available in both axle-forward and axle-back configurations in three cab configurations: day cab, 44-inch (111 cm) sleeper and 64-inch (162 cm) sleeper. Available rear axle configurations include 6x4, 8x4 and 8x6.

Family genes

The Keystone shares its interior architecture with the Mack Pioneer, with wrap-around controls that put a focus on driver comfort. “We designed every element of the Keystone interior with the driver in mind, from the wrap-around controls that keep everything within easy reach, like the ergonomic grab bars that make entering and exiting the cab safer and easier,” said Vince Lokers, specialist chief designer, Mack Trucks.

The Keystone will serve as the replacement for the Pinnacle in Mack’s vocational truck lineup. (Mack)

Like the Granite, the Keystone has an electronic parking brake system and an optional digital mirror system. One feature that is unique to the Keystone is a flat-bottom steering wheel designed for additional clearance. An integrated ELD plate accommodates electronic logging devices, while device holders and cord management systems keep the workspace organized.

The Keystone is powered exclusively by the Mack MP 13 engine that is also available in the Granite, and has the same mDRIVE HD automated manual transmission. While the updated powertrain provides a 3% fuel economy improvement in the Granite, the same updates deliver up to 6% increase in fuel efficiency compared to the Pinnacle. The Keystone also offers the Mack Protect safety suite.

Following the reveal party for the Granite and Keystone tricks, Mack held a press conference at their booth for CONEXPO. Members of Mack’s executive team took the opportunity to provide additional details on the latest additions to the family.

“I'm so happy to be able to share more about the brand and the new Granite”, Wrinkle said. “This truck was made for the dirt. We built this truck stronger, smarter, safer, and more comfortable than ever before.”

Wrinkle provided background on the overall design philosophy of the Granite and what Mack’s goals were for the new truck. “The cab itself is 10-inches (25 cm) larger, but it actually has a shorter BBC,” he explained. “With the bigger cab but shorter BBC, we were able to take out almost four inches of wheelbase. This allowed us to improve the turning radius.”

Wrinkle continued, “We've carried over the proven Cornerstone chassis, but we've optimized the packaging. Some things that we've done are D-shaped fuel tanks. Those help free up space on the frame rail alongside end cab battery box. We've really done a lot to free up space on the frame rail for bodies, because every Granite gets some body put onto it. We've also increased our factory lift axle capacity.”

Wrinkle detailed some of the exterior features of the Granite as well. “We have a stainless steel grille and a new three-piece bumper”, he explained. “So, if you do get any kind of accident, it’s really easy to change those parts.”

One of the notable exterior features of the Granite is its windshield, which Mack has dubbed the Mack impact shield. “If you were at the reveal last night, you saw that we were getting to shoot ice balls at this impact shield at over 70 miles an hour. This component brings two times more impact resistance. It’s also much more scratch resistant and is really going to help (with) longevity.”

Wrinkle also touched on the availability of a smaller displacement engine option for the Granite. “This is an option that is going to offer some weight savings compared to our 13-liter engines. There are some customers that need that.” Mack did not confirm what the curb weights will be for the Granite, but Wrinkle stated that the Cummins X10 could offer as much as 500 lbs. (226 kg) in weight savings.

The 13-liter engine option does net some additional features on the Granite. Wrinkle states that the overall engine-brake power has been increased by over 25% to 630 braking hp. “What that does for our customers is really help them save on brakes, which means less brake pad changes,” he said.

The last aspect of the Granite that Wrinkle discussed was body and upfit details. “One of the things I'm most excited about as the vocational guy is what we can do with bodies,” he said. “We start with BodyLink IV, which is our connecting point. This is where the bodybuilders tap in. We have standard 29-pin connector, but we have additional options, such as the rp170, plus capabilities such as flex switches in the dash. We can even reprogram the split switches. We have a wide variety of things that that bodies can do in integrating with our new truck.”

Key to productivity

Mack’s executives also provided additional details on the new Keystone truck that is replacing the venerable Pinnacle in its vocational lineup. Fernando Couceiro, VP highway products, led the presentation on the key points of the Keystone. “If you have an application that has to handle difficult terrain, on- and off-road, this is your truck,” he said.

Couceiro admitted that the decision to replace a well-known name in Mack’s truck lineup with a new model was not an easy one. “Pinnacle has been a great model,” he said. “It's really been a workhorse for our customers. In our last customer satisfaction survey, it got 100% satisfaction score and has the highest resale value in the day cab tractor segment. It really has this big following, and a dedicated fanbase of customers. So, you might ask, why are we replacing such a successful product? This is a difficult decision, but we wanted to retire it the right way. We also want to bring something that keeps everything the Pinnacle had, but really bring it a couple notches up and add more options than ever before.”

The Keystone has some unenviable shoes to fill replacing such an iconic model, but Mack is confident that customers will be very pleased with what the Keystone has to offer. “Everything that customers loved about the Pinnacle is here, like the proprietary 13-liter engine paired with the mDRIVE transmission. We have the same axle configurations we had with the Pinnacle, with a 6x4 and 8x4 with a pusher axle.”

Fernando Couceiro, vice president of highway trucks. (SAE Media)

“We're also going to have a day cab a short sleeper, a 44-inch short sleeper and a 64-inch sleeper. Both of them stand-up sleepers. These are all things we had in the Pinnacle, but now we're adding a lot more options, like an axle back configuration. The truck we have here in our booth is an axle back 64-inch sleeper. This is something we didn't have in the Pinnacle, it was only axle forward.”

Couceiro also outlined the increased front axle capacity of the Keystone. “We're also going to have an option for it to have a heavier front axle load,” he explained. That will be paired with our 540-hp engine. We're really made this truck capable for heavy haul.”

Two of a kind

Both the new Granite and Keystone will be available for order through Mack’s dealer network in the second half of this year. Production for the Grantie is set to begin at Mack’s facility in Pennsylvania in January of 2027.

Mack is very optimistic about the future success of both these trucks. Which is bold considering that one of them, the Keystone, is replacing one of the most successful products in the vocational space. That said, Mack’s launch party at Las Vegas Motor Speedway, which featured a full fireworks display, drone show and executives dressed in Stetsons, is an indicator that the company is confident in its multi-billion dollar investment.

Mack’s unveiling of not one but two trucks during CONEXPO was also a closely guarded secret. “We've been waiting for this for a very long time,” Wrinkle said. “We were celebrating a birth yesterday, and we got to tell our dealers ‘Hey, congratulations! It's twins!’”