All of this blood, sweat, tears and $$ put into my Town Car to take care of preventative maintenance and make her last for me and it starts making what may be a really scary sound last night. It's a high pitched squeal/rotational whirring that comes and goes and is most evident when warm and best heard back toward the fire wall or under the car. It is hard to tell whether it's a rotational squeal or a vibrational one. It does come and go with change in RPM and doesn't seem to mind whether it's in gear or park. Obviously I confirmed it wasn't a belt, fan or pully based on the location. The exhaust feels really solid too. I'm just concerned it's a transmission issue, but would that be intermittent and RPM dependent? I realize this is still pretty vague and could be any number of things, but does it sound familiar to anyone?