Windsheild problem!

[BradyQ]

I have a 1997 Tahoe and when on the highway at 55+ mph my windshield starts to rattle, like it's going to come out of the frame.

No leaks, and I have gone a few hundred miles like this. Does anyone know if it poses a problems other than the annoying sound? Anyone else?

[Steve]

Brady, do you still have this problem? Is it the gasket gone out? Do you have any water leaks inside of the windshield?