My 2001 Buick Regal just started making a noise that sounds like a bad wheel bearing. It's a loud humming noise. It does it at all speeds and sounds faster and louder as you go faster, and there is no sound at a stop. I can not tell where it is coming from. I checked all four wheels and one does not feel hotter than the others (I thought I remembered doing this to check for wheel bearings when I was a kid). A while ago it started shifting harder than usual when warmed up, but the sound is there when coasting in neutral as well. It has 130,000 miles, new brakes on the front and I am about to do the rears.

Check the wheel bearings with the wheels up and spin them by hand. Of course you need to put it in neutral for the fronts.

Trans is probably a separate issue.

A bad bearing might not heat up until it's pretty bad,

T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/