Remanufactured from Weller, the Allison MT643 transmission delivers smooth shifting, dependable power transfer, and long-lasting durability for medium-duty trucks, buses, and vocational vehicles. Built to OEM Allison standards, this model features multiple forward speeds, a hydraulically controlled design, and a rugged construction engineered for consistent performance under demanding conditions. With Weller’s precision remanufacturing process, the MT643 helps fleets minimize downtime, lower maintenance costs, and maintain reliable operation mile after mile.