Quote:
Originally Posted by Counterfit
There are things that run at vehicle speed in the drivetrain, such as the axles and tires. But since this sound doesn't appear until 25-30,it's probably a lose thing.
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Yes, but you missed the key point, the "sound" gets LOUDER but does not change frequency, this rules out tires (rock in the tread, bad tread, etc.), axles & driveshaft, brake backing plates (getting hit by a rotor), etc.
Thus it's a speed issue, likely ruling out engine, trans, axles, tires, etc.
That's why I'm leaning to a shield/cover, fender liner, maybe even trim on the outside.