i have a 97 LS and above 40 it sounds like the moonroof shade is rattling also could be the passenger front seatbelt. Opening the shade 3/4 of the way seems to help a bit but nothing conclusive. I imagine some of you are experiencing a similar thing. It drives me nuts knowing that the only thing keeping me from experiencing my silent rocket to its fullest is this rattle. Any suggestions or insight would be wonderful.