Bearings are what enable the gears to rotate smoothly. They are usually designed from bronze or brass, they usually in shape into races (or grooves) in the gearbox housing. Which is why manufacturers came up with inner filters. These filters can be found on lots of modern computerized transmissions. Internal https://filter-gearbox29383.bloggerswise.com/41479145/the-fact-about-filter-gearbox-that-no-one-is-suggesting