2026 Mack GR64B

2026 Mack GR64B, purpose-built workhorse, combines legendary Mack durability with modern efficiency to maximize your productivity. The powerful yet lightweight 425 HP Mack MP7 engine is paired with a smooth and reliable Allison 4500 RDS 6-speed automatic transmission, ensuring consistent torque delivery and easy operation even in the most demanding conditions. Featuring the proven Mack Camelback tandem axle suspension, this truck offers superior traction and articulation for excellent performance on rugged terrain, plus a robust 20,000-pound front axle and 46,000-pound rear axle rating. With a clean, new-vehicle slate and a heavy-duty chassis ready for your specific body, this truck is the perfect choice for applications like bulk hauling, refuse, or construction, where reliability and performance are critical.