Bearings are what enable the gears to rotate efficiently. They are generally made out of bronze or brass, and so they in shape into races (or grooves) from the gearbox housing. It guarantees that every one works are going to be done in total compliance with technical necessities of automakers. https://stephenpdnvf.get-blogging.com/34625606/the-definitive-guide-to-filter-gearbox