A gearbox, in essence, acts because the middleman, catching the baton from the prime mover (may well it's an electric motor or an inside combustion motor) and passing it on towards the driven shaft – a propeller shaft of the car or an industrial device’s spindle. Once-a-year gearbox inspection. https://marcoqsqol.blogolize.com/the-fact-about-gearbox-that-no-one-is-suggesting-72854448