A gearbox, in essence, acts as being the middleman, catching the baton in the key mover (might it's an electric motor or an inner combustion motor) and passing it on for the driven shaft – a propeller shaft of a vehicle or an industrial device’s spindle. Yearly gearbox inspection. https://keeganvvtrq.blogsidea.com/40192672/new-step-by-step-map-for-gearbox