The manual valve is what the shift lever hooks as many as. Based on which equipment is chosen, the manual valve feeds hydraulic circuits that inhibit specific gears. As an illustration, In the event the shift lever is in 3rd equipment, it feeds a circuit that prevents overdrive from partaking. https://gearbox-auto10741.blog5star.com/34633533/new-step-by-step-map-for-gearbox-auto