Fuller, an Eaton brand, is the dominant name in heavy-duty manual transmissions for Class 8 trucks. The Fuller 13-speed and 18-speed UltraShift and Roadranger transmissions are found in a wide range of Peterbilt trucks, particularly in vocational and long-haul applications. This collection includes Fuller transmission parts, filters, and components for maintaining and repairing these workhorses. Keeping your Fuller transmission properly serviced is essential to drivetrain longevity and avoiding costly failures on the road.