Driver Window tilts forward on way up

The front of the window dips about 1.5 inches when it is at 3/4 up.

Does anyone have a clue of what to look for? The glass seems to be correctly attached to the frame. I tried to adjust the guide but not much movemnt there.

Thanks Brothers!

Yah, mine just started to do the same thing. Can't figure it out either.

Mine does the same thing. Turns out that its the plastic sliders the connect the track the window is attached to and the regulator.

The only way I know to fix it is to replace the complete regulator assembly. I was unable to find the replacement plastic pieces at work in the Dorman book.