Bearings are what allow the gears to rotate smoothly. They are typically designed out of bronze or brass, and so they fit into races (or grooves) in the gearbox housing. There are two main types of transmissions: automated and manual. Automatic transmissions use fluid couplings rather than a clutch, and https://jeffreyejihf.csublogs.com/41111239/top-filter-gearbox-secrets