Among the many issues my retarded cars are giving me nowadays is a weird noise, sort of like a high pitch vibration or humming when im at higher speeds (about 70mph and above) and it increases as speed goes up. I've taken the 35th upto 120 and it does it pretty bad at those speeds. It started on my 89, but i thought that it was perhaps b/c the windshield is cracked....pretty badly cracked...so i attributed it to that. HOwever, my 35th just recently started doing it and its windshield is intact. Its as if the windshield was vibrating, but when i try to push on it from inside to see if It makes any difference it does not. I also try tugging around the rear view mirror but no difference either....any clues?