Eaton-Fuller UltraShift 13-Speed AMT

The Eaton-Fuller UltraShift PLUS is an automated 13-speed transmission derived from the legendary Fuller Roadranger manual gearbox. The Roadranger's reputation for durability — built on 50 years of the manual 13-speed RT-6613 — was the reason Kenworth and Peterbilt specified it as a standard gearbox choice for their flagship trucks. The UltraShift adds an electronic actuator to the same mechanical core, providing automated convenience without sacrificing the 680 Nm input capacity. Kenworth, Peterbilt, Freightliner, and Mack all offer the UltraShift as a factory option.