Bearings are what allow the gears to rotate effortlessly. They are generally manufactured outside of bronze or brass, and they match into races (or grooves) inside the gearbox housing. That's why makers arrived up with inner filters. These filters can be found on lots of modern-day computerized transmissions. Internal filters https://filtergearbox92233.anchor-blog.com/14407980/5-easy-facts-about-filter-gearbox-described