Bearings are what enable the gears to rotate effortlessly. They are generally created from bronze or brass, and so they in shape into races (or grooves) while in the gearbox housing. That's why manufacturers arrived up with inner filters. These filters are available on many modern automatic transmissions. Inside filters https://becketthpwfm.blogaritma.com/32384460/examine-this-report-on-filter-gearbox