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Mack Debuts Keystone Class 8 Tractor as Pinnacle Replacement
OEM's Focus Is Agricultural, Construction, Logging Markets
Key Takeaways:
- Mack launched the Keystone tractor as part of a broader effort by Volvo Group to grow its North American heavy‑duty market share.
- The Keystone replaces the Pinnacle and offers multiple axle, cab and suspension configurations with improved fuel efficiency.
- Mack orders and sales declined year over year despite vocational demand and new model introductions.
Mack Trucks late March 2 unveiled a new Class 8 vocational tractor, the Keystone, in the latest phase of a lineup overhaul intended to support its parent company’s North American heavy-duty truck market share ambitions.
Volvo Group is aiming for a 25% heavy-duty truck market share by 2030 on the back of the introduction of the Keystone and Pioneer models plus overhauls for the Anthem and Granite models.
Sister company Volvo Trucks North America’s VNL and VNR models also received major revamps as part of the strategic initiative.
In 2025, Mack’s North American heavy-duty truck market share rose to 8% from 6% on the back of an improved supply chain and relatively good vocational segment demand, Volvo Group said when releasing its fourth-quarter 2025 earnings Jan. 28.
The order book for the Keystone will open late in the third quarter of 2026. It replaces the Pinnacle model in Mack’s vocational lineup. The Pinnacle was introduced in 2006, replacing the Vision.
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“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,” Roy said.
After the curtain was pulled back in Las Vegas, Mack said the Keystone is based on the same cab platform as the Pioneer and revamped Anthem. Among the differences is a modular bumper system designed to accommodate various tow configurations.
Three cab configurations are available: day cab, 44-inch sleeper and 64-inch sleeper, each offered in both axle-forward and axle-back positions. Rear axle configurations include 6x4, 8x4 and 8x6.
It is the first time Mack has offered this class of vocational tractor in both axle-forward and axle-back configurations, with the truck maker saying the move will provide customers with greater flexibility to match their specific operational needs.
“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 , 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 powertrain for the Keystone is Mack’s MP13 engine, which delivered up to 540 horsepower and 1,950 pound-feet of torque. Transmission alternatives comprise the in-house mDrive and mDrive HD automated manual options plus the Allison RDS Series automatic option.
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According to Mack, the powertrain delivers up to 6% greater fuel efficiency compared with the Pinnacle.
Customers can choose to install Maxride suspension. “When you’re operating on challenging roads, ride quality becomes even more important,” Couceiro said. “The Keystone’s suspension and cab engineering deliver an unmatched smooth, comfortable ride that reduces driver fatigue, even in the most demanding conditions.”
In addition to North America, the Keystone will be available in select Latin American markets, the first time Mack has offered this class of vocational tractor in the region.
The Keystone comes standard with Mack’s integrated uptime solutions, including a complimentary five-year subscription to Connect, Mack’s telematics platform.
Mack launched the Keystone at the Las Vegas Motor Speedway ahead of the ConExpo-Con/Agg 2026 conference, which began March 3.
Alongside the Keystone launch, Mack revamped the Granite with a new cab, increased fuel efficiency and extra safety features. Production of the latest iteration of the Granite will begin in January 2027 at the Macungie plant.
Mack orders in North America totaled 5,615 trucks in Q4, a 30% drop year over year from 7,969 despite the vocational market strength and new on-highway tractors as the freight sector remained in the doldrums. Mack’s North American orders in 2025 fell 8% to 20,516 trucks from 22,407 a year earlier.
North American truck sales at Mack in the three months that ended Dec. 31 totaled 6,087 vehicles, a 14% year-on-year decline from 7,104 trucks a year earlier, Volvo Group said.
