There is no switch for this valve body, it is all still hydraulically actuated. In stock form, your shifter allows you to select P-R-N-OD-D-1. With this valve body, if it were printed out, the selections would be P-R-N-OD-2-1. With this valve body you can manually select and hold 1st and 2nd gear. When in OD, it will shift like a normal automatic transmission.