Mack Trucks has bolstered its Class 8 vocational lineup, rolling out the all-new Keystone and a reimagined Granite.

Promising brawn and brains to complete the toughest jobs, the trucks were unveiled March 2 at the Las Vegas Motor Speedway in Nevada.

“These trucks get the job done while helping you make faster, better, real-time decisions about your vehicles, your people and your business,” said Martin Lundstedt, president and CEO of Volvo Group, addressing hundreds of guests gathered for the launch.

The Keystone targets demanding on- and off-road environments. Building on the legacy of the Pinnacle, it delivers the same technology and safety as the Pioneer and Anthem models.

Named after the Keystone State

“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,” said 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.”

“Our customers told us they wanted a truck that could handle the toughest jobs and job sites without compromising driver comfort or modern technology,” added Jonathan Randall, president of Mack Trucks North America.

“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 at Mack Trucks. “Whether 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.”

Axle-forward and axle-back configs

For the first time, Mack is offering this class of vocational tractor in both axle-forward and axle-back configurations. The Keystone is available in day cab, 44-inch sleeper and 64-inch sleeper configurations, each offered in both axle positions. Rear axle configurations include 6×4, 8×4 and 8×6.

The interior features supportive seating, an electronic braking system for easier operation, an available digital mirror system and a flat-bottom steering wheel designed to improve belly room. An integrated ELD plate accommodates electronic logging devices, while device holders and cord management systems help keep the workspace organized.

A modular bumper system is designed to accommodate various tow configurations. A bullet lamp on the cab roof provides improved visibility and compliance.

The truck is powered by the Mack MP13 engine, delivering up to 540 horsepower and 1,950 lb.-ft. of torque, paired with the mDrive HD automated manual transmission. The powertrain delivers up to 6% improved fuel efficiency compared with the Pinnacle, according to the OEM. It also offers the Mack Protect safety suite available on the Pioneer and Anthem.

Keystone comes standard with integrated uptime solutions, including a complimentary five-year subscription to Mack Connect, the company’s telematics platform.

Reimagined and redesigned Granite

Mack also revealed the reimagined and redesigned Granite, featuring a new cab, updated safety technologies and enhanced driver comfort.

The available Mack Protect safety suite includes a front camera, front radar and 270-degree radar coverage with both passenger- and driver-side radar systems, which Mack claims to be a first in the vocational segment.

The Granite is the first vocational truck to feature an electronic parking brake with rollaway protection and auto release when shifting into gear. Additional safety features include standard front airbags, available side-curtain airbags, and standard LED headlamps and fog lamps with optional cornering lights. E911 auto-call is standard, automatically contacting emergency services when in cellular range if an airbag deploys or the system detects a rollover or collision.

Five camera inputs

An optional camera system provides up to five camera inputs, including a backup camera and a downward-facing passenger-side camera. An optional digital mirror system is also available.

Granite will be available in day cab and 44-inch sleeper configurations in both axle-forward and axle-back positions, with multiple front and rear axle ratings. The truck is offered in graphite and bright trim packages with LED headlights, three-piece bumper options and an available sun visor. An optional hatch provides fluid access for snowplow applications.

The engine

It features the Mack MP13 engine, rated up to 540 hp and 1,950 lb.-ft. of torque, delivering up to 3% improved fuel efficiency compared with the previous engine, the company claims.

The updated mDrive automated manual transmission, available in 12-, 13- and 14-speed configurations, provides faster shifts for improved responsiveness. The 13-speed includes a low-reduction creeper gear for improved startability on steep grades and with heavy loads, while the 14-speed offers a 32:1 ultra-low-speed reduction gear for precision applications.

Granite also offers the Cummins X10 engine, rated from 350-450 hp and 1,250-1,650 lb.-ft. of torque, paired with an Allison automatic transmission.

The truck is equipped with the MaxRide air load-distributing suspension, a non-torque-reactive eight-bag system proprietary to Mack.

It features a galvanized steel cab with nine inches of additional width at the B-pillar for increased interior volume. A one-piece bonded curved windshield is designed to improve durability and impact resistance, while a 113.5-inch bumper-to-back-of-cab dimension is intended to simplify bodybuilder adaptation.

The interior

The interior is available in three trim levels and includes a digital instrument cluster and a three-way adjustable steering column. An available premium air-shock seat offers four-way lumbar support, massage, and heating and ventilation functions.

A body builder tower positioned between the seats provides a mounting surface for controls, gauges and equipment or can be configured as additional storage. Built-in dash mounting points provide reinforced locations for ELDs and other devices. Dual USB-C and 12-volt auxiliary power outlets are standard, and a wireless phone charger is available.

The hood profile draws inspiration from the Mack R model, with a lowered side air intake designed to improve forward visibility while maintaining space for cooling.

A modular bumper system uses a common centerpiece to accommodate center and side tow configurations with interchangeable end caps for axle-forward and axle-back positions.

Over-the-air updates

Granite also offers BodyLink IV with redesigned electrical architecture enabling customizable logic and diagnostics.

Mack Connect telematics and over-the-air updates allow remote software updates for individual trucks or entire fleets. The MyMack mobile app provides drivers and fleet managers access to vehicle information and remote diagnostics.

The Granite will be available for order in the latter half of 2026, with production beginning in January 2027.