I was just as shocked as you are when I first went to do the same thing. From what I understand the transmission is a "closed" system and shouldn't require the addition of fluid......yeah right. The only way to check, and fill, the transmission is to get under the VX and check it there. Someone will have to back me up on this, but I think there is a check plug, as well as a drain plug, on the tranny (I know there is on the transfer case).