The manual valve is just what the shift lever hooks as much as. According to which equipment is chosen, the guide valve feeds hydraulic circuits that inhibit certain gears. For example, In the event the change lever is in 3rd gear, it feeds a circuit that forestalls overdrive from partaking. https://gearbox-auto20741.blogthisbiz.com/40985544/5-easy-facts-about-gearbox-auto-described