desertdriver

You were correct Lemon. Just had the driver side rear bearing replaced at 48,000 miles. Saw the original bearing too, mechanic showed me how it was starting to display resistance when turning. He also told me that if not ultimately replaced, could result in freezing up, a very dangerous condition. He said that bearing replacments were not uncommon in Toyota products. It's nice not to have that humming sound anymore.

Hi. My 2004 RX 330 has a similar sound at 50+ mph, sounds like one of those old spinning tops, coming from rear drive train. Did you replace the wheel bearings on yours, and did that solve the problem? Thanks!