Nah, it's not quite a whistle, it's weird to explain. It really only seems to happen after the car has sat overnight and the low has been under 25F.
Doesn't really worry me though, I've heard a lot worse come from a transmission, and it disappears once things start to warm up. The transmission in my moms Odyssey sounds like it has straight cut gears sometimes, like something out of a race car.
Where are the "SuperMECHANICS" on this forum. Until now I am usually impressed because they usually have an "idea" or know how to guide you to a solution other than have our mechanics rip us off. But no advice on the problem after 4-5 posts???!! I've been having the exact vibration sound during this winter and it's ANNOYYING!!! It sounds almost like a small pin hitting a metal fan as it's spinning from my tranny area.. I can hear in my cabin and it goes away after some driving and when it warms up... HELPP!!! Makes my GS300 seem CHEAP for a luxury car!!!! Now I'm forced to turn my music up to drown out the sound HEEELLPP!!!