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I'm having a curious sound come up in my front end when I hit about 40 mph. It's a high whining sound that reminds me of the whining of a jet engine (not that loud though!). If I throw it in neutral and bring the engine to idle, it doesn't change it, nor does it do anything when I rev the engine. It seems that roadspeed is the only factor, and the whining gets higher as I get faster. The sound is intermittant.

I've heard bad bearings in a friend's truck once before, and the sound was much different, a very distinct grinding sound. Also, I jacked up the wheel and didn't hear any obvious bad sounds coming from either front wheel, so if it is bad bearings I couldn't check it that way. But I can't think of anything else that it might be. Has anybody had an experience with bad bearings that might make them sound like a high-pitched whine? Is there any symptom of disc brake problems that might make this sound?
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