The handbook valve is just what the change lever hooks as many as. Depending on which gear is chosen, the handbook valve feeds hydraulic circuits that inhibit selected gears. As an illustration, In case the shift lever is in third gear, it feeds a circuit that forestalls overdrive from participating. https://charliemtxae.oblogation.com/33318757/the-smart-trick-of-gearbox-auto-that-no-one-is-discussing