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Sound from rear of car, above 45mph


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So I've had my 05 Outback 3.0R for a week now and I love it!! But as soon as I hit 45mph I can hear a noise coming from the rear of the car somewhere. My girlfriend thinks I'm hearing things, so that gives you an idea of how loud it is. :lol:

 

It vaguely reminds me of the sound a fuel pump makes, but its pitch gets higher with speed, not with throttle. It is a stable pitch and speed, and does not fade in and out like a blown wheel bearing might. Its like gear "hum," but not noise, if that makes sense.

 

The car doesnt bog down when I hear the sound and I had it up to 110 over the weekend just to test the waters (I have 3 month/3k mile warranty). The sound barely increased in volume, and there were no burning smells... everything seems fine.

 

I was thinking maybe its a "hum" from the LSD?:confused:

 

Or maybe I am just paranoid and trying to pick out problems? Maybe my girlfriends right, and I'm crazy. Any ideas are welcome!

 

Thanks!

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