whining sound from wheels

2001 FORD CROWN VICTORIA
148,000 MILES
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RICHARDZEMPEL
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SAME AS ABOVE QUESTION: I have a 2001 Ford Crown Victoria Police Interceptor that for many months is making a whining sound from wheels or rear-end when alternating pressure on the gas pedal. No sound with hard acceleration. Not an engine sound. Checked differential oil and it was very low, so we filled it, 30k miles ago.Sound is slightly louder over time/40k miles. I'd like to stop the sound so I can sell the car.
MORE:
Mechanic friend says might be wheel bearing or differential and not to worry about finding it til the problem becomes clear what or where it is. It is mysterious, but the car runs great. I just think it will be hard to sell this way.

Is there a repair I can make or some oil or additive I can add to the differential that will stop the whining sound?

Thanks!
Dec 29, 2011 at 3:52 PM
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RASMATAZ
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Could be the wheel bearings or the pinion and drive gear in the differential
Dec 29, 2011 at 4:02 PM
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WAY2OLD
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Get a couple of bottles of friction modifier and put it in the rear end to see if it helps. If the noise is more prevalent when accelerating or decellerating, it is more than likely a pinion bearing. if it is constant with any steady speed, more than likely it is the carrier bearings. If it is more prevalent on turns it is more than likely an axle bearing.
Dec 31, 2011 at 12:55 AM
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SAILSOON
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http://www.youtube.com/watch?v=l7xin5Uyjd0&feature=related
http://www.youtube.com/watch?v=y3bvHd12unI&feature=related

Had the same problem on Crown Victoria 2006. You have to open differential to replace wheel bearings anyways so replace pinion, carrier and wheel bearings for approx 150$ for parts and follow instructions on liks above.

No more noise now and peace of mind for 1-2K miles
Jan 23, 2012 at 3:50 PM
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SAILSOON
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Forgot to mention my Crown Victoria is a police interceptor with 200,000Km (120,000 miles on it)

Rear wheel bearings are flat roller bearings so noise of bad bearings will not be very prevalent on turns.
Jan 23, 2012 at 4:00 PM