Mack Unveils Keystone and All-New Granite at ConExpo 2026

Mack Trucks introduced two new Class 8 vocational models ahead of CONEXPO-CON/AGG 2026 in Las Vegas: the all-new Mack Keystone and the reimagined Mack Granite.

Both trucks expand Mack’s vocational lineup and will be assembled at the company’s Lehigh Valley Operations facility in Macungie, Pennsylvania.

Mack Keystone

The Mack Keystone is a purpose-built Class 8 vocational tractor designed for construction, agriculture and other demanding applications requiring both on-road and off-road capability. It is powered exclusively 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 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.

The Keystone is available in axle-forward and axle-back configurations with 6x4, 8x4 and 8x6 rear axle options. Cab configurations include day cab, 44-inch sleeper and 64-inch sleeper.

According to Mack, the MP13 powertrain delivers up to 6% improved fuel efficiency compared with the Pinnacle model.

All-New Mack Granite

Mack also unveiled the reimagined Granite, featuring an all-new galvanized steel cab that is nine inches wider at the B-pillar. The Granite introduces new safety systems including the available Mack Protect safety suite with front camera, front radar and 270-degree radar coverage, including both driver-side and passenger-side radar.

“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,” said Stephen Roy.

The Granite offers the MP13 engine rated up to 540 HP and 1,950 lb.-ft. of torque, as well as an available Cummins X10 engine rated from 350-450 HP and 1,250-1,650 lb.-ft. of torque.

Production of the new Granite will begin in January 2027, with ordering available in the latter half of 2026. The Keystone is expected to be available for order in late Q3 2026.