3/8 drive for the drain plug and a 17mm for the fill plug. Remove drain bolt and drain the fluid into a oil pan. Reinstall drain plug. Remove fill plug and either find a way to sneak a funnel with a hose on it through the top (engine bay) or something to pump fluid into the fill hole. Pump mtf into the tranny until it comes out of the fill hole. Reinstall fill plug. Good habit is to break loose both the fill and the drain plug before draining any fluid incase you can't get the fill plug loose.
