The manual valve is just what the change lever hooks up to. Based on which gear is chosen, the guide valve feeds hydraulic circuits that inhibit particular gears. As an illustration, In the event the change lever is in third equipment, it feeds a circuit that forestalls overdrive from engaging. https://gearboxauto52840.is-blog.com/40664103/the-single-best-strategy-to-use-for-gearbox-auto