From remote job sites to long highway stretches, the all-new Mack Keystone® is built to go where the work takes you. This purpose-built Class 8 tractor delivers the terrain versatility, durability, and driver-focused technology today’s toughest applications demand. Designed for construction, agriculture, logging, livestock hauling, and heavy-haul operations, Keystone transitions seamlessly from unpaved roads to interstate highways — without compromising comfort, safety, or performance. TERRAIN VERSATILITY WITHOUT COMPROMISE Featuring higher ground clearance, optimized approach angle, axle-forward and axle-back configurations, and available Mack MaxRide™ suspension engineered for superior ride quality on rough terrain and highway alike. PROVEN MACK POWER Powered exclusively by the Mack MP®13 engine (up to 540 hp and 1,950 lb-ft of torque) paired with the mDRIVE™ HD automated manual transmission. Delivering up to 6% improved fuel efficiency compared to its previous model, Keystone is ...