The Eaton Fuller Ultrashift Transmission Control Unit (TCU) is the brain behind the smooth, automated shifting in Gen 3 Autoshift, Ultrashift and Ultrashift PLUS transmissions. Working in tandem with the XY Shifter, the TCU monitors and manages gear selection, clutch engagement, and shift timing to optimize performance and fuel efficiency. These TCMs are essential for maintaining performance and reliability in demanding commercial and fleet environments where uptime is critical. Weller Truck Parts offers professionally remanufactured Gen 3 Eaton UltraShift TCUs that exceed OEM specifications. Each TCU is thoroughly inspected, rebuilt, and tested at a variety of temperatures to ensure peak performance and lasting reliability. Potting is added to provide moisture, heat, and vibration resistance, and high current and high duty cycle components are replaced. Weller’s remanufactured TCUs are backed by an industry-leading warranty, and customers benefit from Weller’s knowledgeable tech support and responsive customer service. Weller’s remanufactured TCUs deliver dependable performance, aftermarket innovation, and exceptional value. Remanufacturing operations performed in Michigan, USA by IPC Certified Technicians.