When the computer decides the time is true, it disengages the clutch automatically, selects a whole new gear after which re-engages the clutch. The change valve is pressurized with fluid through the governor on one facet, plus the throttle valve on one other. They're equipped with fluid by the pump, https://johnathanirwac.blogsmine.com/34241794/not-known-facts-about-gearbox-auto