11166 Transmission O-Ring, James Genuine (#11166)

This genuine James Gaskets transmission O-ring is a stock replacement part for the four-speed and three-and-reverse transmissions used in 1936 through 1986 Big Twin models, including FX and Softail applications. It is designed to replace OEM number 11166, providing a high-quality seal that prevents oil leaks and maintains transmission pressure. While many vintage transmissions have been modified over the years, this O-ring is built to the original specifications for a reliable fit. It is an essential component for any gearbox service or restoration project. James Gaskets is a trusted name in the industry, and this O-ring ensures that your classic Harley-Davidson transmission remains properly sealed and protected against the elements and internal fluid pressure.