There's two major kinds of transmissions: automated and manual. Automated transmissions use fluid couplings as opposed to a clutch, and they generally have more gears than guide transmissions. The transmission filter allows to get rid of dirt and contaminants from the automatic transmission fluid, which serves a number of needs, https://lorenzobpcra.blogpixi.com/34340271/5-easy-facts-about-filter-gearbox-described