No, the gearbox consists of the gears; the clutch can be a independent ingredient that connects the motor on the transmission. This gearbox can help in The graceful acceleration from reduced velocities, too it responses effectively at low motor revs. The change valve is pressurized with fluid through the governor https://brooksgoqqo.shotblogs.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox-auto-48069923