Abstract: A gearbox dampening system configured to absorb axial movement of the crank of the airboat engine to reduce damage causing vibration and noise is disclosed. The gearbox dampening system enables a gearbox to be releasably coupled to outer support structures of an engine to support the gearbox and enables one or more gears of the gearbox to be in communication with a crank of an airboat engine via one or more dampeners. In at least one embodiment, the one or more dampeners significantly reduces stresses imparted on the gears of the gearbox via axial movement of the crank of the engine created when the engine is running. In particular, axial movement of the crank of the engine, which would usually create noise, chatter and engine damage, is absorbed by the dampeners positioned between the crank and the one or more gears in the gearbox supporting an airboat propeller.