Pop the hood and take a look at the back side of the headlights. You'll notice an adjustment screw with a wide head (~2/3") that has some little teeth on one side. It's fairly close to the middle of the light on the vertical axis and a little past the center towards the fenders on the horizontal axis. I was able to turn mine by hand without too much trouble, but it does have a nut on the end that IIRC is 9/16" or so. I'd take a pic of it for you, but my wife is out with the truck right now.