1998 Ford Explorer whine noise

1998 FORD EXPLORER
137,000 MILES • 6 CYL • 4WD • AUTOMATIC
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JOHN HO10
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Have a whine noise like a tuning fork, that seems to be coming from the right (passenger) side. Whine increases with speed, but NOT RPM related. When in neutral, coasting the whine is evident.

The differential, transfer case and trans fluids have been replaced per Ford's recommendations.

Could it be tire related? They're over 10 yrs old, Goodyear wranglers.

Drive line problems, pinion gear? Or hub bearing? There is no grinding or rumbling.

Just a noticeable whine. Driving me nuts and not changing in frequency. HELP!
Sep 3, 2014 at 5:04 AM
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JACOBANDNICKOLAS
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Does the noise change when you make turns? As far as the tires, wow, 10 years... Are they worn evenly?
Sep 3, 2014 at 5:11 AM
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JOHN HO10
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All tires are evenly worn. I rotate every oil change and maintain proper inflation. I replace and maintain suspension parts as needed. Shocks have been replaced every 55M miles.
The whirring/whine is noticeable only while driving straight at 20-25mph plus. Not noticeable on turns as speed is diminished.
Hope that helps/ Thanks.
Sep 3, 2014 at 10:35 AM
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JACOBANDNICKOLAS
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This is a tough one without being there. Tell me, have you checked the brakes to make sure a sensor isn't touching? Have you checked the backing plate behind the rotors to make sure they are not rusted or damaged and touching the rotors?
Sep 3, 2014 at 7:51 PM
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JOHN HO10
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Yes. I've checked that already. Other suppositions?
Sep 4, 2014 at 9:42 AM
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JACOBANDNICKOLAS
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Based on what you have told me, I feel it has something to do with a hub bearing.
Sep 4, 2014 at 6:07 PM