I have the same noise, I doubt it's the throw out bearing. I just hit 50,000 miles in my car. The transmission is not the one that came with the car because that one kind of exploded. But I got a rebuilt one and the clutch has about 10,000 miles on it. The throw out bearing was replaced when the clutch was of course. Yea so I have no idea and neither does the transmission guy, all he does is work on transmissions, he's been in business for 50 years and he still has no idea what it is.