Students should be able to Explain the construction and operation of different types of gearbox Explain the principle of operation: Propeller shaft Universal joints Explain the function of the rear axle. Explain the construction, operation and adjustment of rear axle Identify various tools and equipment for the removal, repair and adjustment of gearbox. State different types of gears in the rear axle, i.e. Crown wheel, sun wheel planet gears and pinion.