The gears in a car or truck transmission box are metallic discs of various sizes with different ridges and range of enamel. They're in all auto gearboxes, set over the shafts (other than the principle shaft), and may slide in both way. Kalau korang perasan ada tanda gearbox kereta rosak, https://cesarnonli.frewwebs.com/34693164/the-ultimate-guide-to-komponen-gearbox-auto