Bearings are what enable the gears to rotate easily. They are generally manufactured out of bronze or brass, they usually suit into races (or grooves) from the gearbox housing. That's why manufacturers arrived up with internal filters. These filters are available on several modern automatic transmissions. Inside filters have bigger https://filter-gearbox03578.theobloggers.com/40353925/the-best-side-of-filter-gearbox