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2026 MACK, MD6, Medium Duty Trucks - Cab & Chassis Trucks, CUMMINS , Automatic, Now In Stock: 2026 Mack MD642 Built for Regional and Local Delivery Power The 2025 Mack MD642 is a medium-duty workhorse designed for pickup, delivery, and short-haul service. Powered by the Cummins ISB6.7 diesel engine delivering 260 HP and 660 lb-ft of torque, paired with an Allison 2500 RDS 6-speed Rugged Duty Series automatic transmission, this truck is engineered for reliability and efficiency. This unit features a 274" wheelbase, Glacier White solid paint, a 90-gallon aluminum fuel tank, and a GVWR of 25,995 pounds perfectly spec'd to avoid CDL requirements in many applications. Equipped with Bridgestone R268 Ecopia front tires and M760 Ecopia rear tires on white powder-coated steel wheels, air ride rear suspension, and Meritor axles (10,000 lb front, 19,000 lb rear), the Mack MD6 offers superior durability and a smooth ride. Driver comfort includes a premium interior trim, Mack air-susp |