Bearings are what enable the gears to rotate smoothly. They are usually designed out of bronze or brass, plus they fit into races (or grooves) from the gearbox housing. Based on the positioning, all automatic transmission filters may be divided into inner and exterior filters. External filters can be found https://filter-gearbox32962.azzablog.com/34263575/how-much-you-need-to-expect-you-ll-pay-for-a-good-filter-gearbox