The Gen 2 Eaton AutoShift & UltraShift Transmission Control Unit (TCU) is responsible for managing gear selection and shift timing. Designed to optimize drivability and fuel efficiency, the TCU communicates with engine and transmission sensors to deliver smooth, consistent shifting in a wide range of operating conditions. Its durable design and proven performance make it a trusted solution for heavy-duty commercial vehicles. Weller Truck Parts offers professionally remanufactured Gen 2 Eaton AutoShift and UltraShift TCUs that exceed OEM standards for quality and reliability. Each unit is carefully disassembled, inspected, and rebuilt by IPC certified technicians using advanced testing procedures to ensure long-term performance. Weller’s remanufactured TCUs are backed by an industry-leading warranty, and customers benefit from Weller’s knowledgeable tech support and responsive customer service. Whether you're replacing a failed unit or proactively maintaining your fleet, Weller delivers dependable solutions with the support you need to keep your trucks on the road. Rework is performed in Michigan, USA.