I cannot locate a dipstick for the tranny on my daughter's '04 explorer! Called Ford dealer...they advised it is a 'closed system' (heard of this with rear ends, but not trannies.) How can you check the fluid level?? Her tranny sounds 'dry' & is grinding badly! I am old-school & have always worked on our vehicles...is this Ford's way of assuring we HAVE TO go to a mechanic?