I can hear the gears clunking and squeaking on occasion, I described it to a mechanic friend and they said I should check the transmission fluid. If it just needs refilled it will be an easy fix. But the manual doesn't describe it very well at all. It just has a picture of the outside of the truck with an arrow pointing to the underside of the drivers door and says to unscrew the bolt. I looked under there, but I can't see where to check it. I searched the internet, but I couldn't find any good pictures describing where that little bolt is.

Can any one show me how to find the place to check my transmission fluid?