2002 Pontiac Aztek Noise in rear end

2002 PONTIAC AZTEK
92,795 MILES • 4 CYL • AWD • AUTOMATIC
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PATTYOFAVON11
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Hi When I turn right or left my back wheels make a whinning noise. We had the wheel bearing changed twice and the knuckle and we had a wheel alignment and new tires. what do you think this noise could be?
Aug 14, 2009 at 6:50 PM
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SERVICE WRITER
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Rear disc or drum?

Are you turning on blacktop?

Will it do it in reverse?
Aug 14, 2009 at 8:09 PM
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PATTYOFAVON11
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It does not do in reverse . And it does'nt matter what kind of pavement.
Aug 15, 2009 at 7:44 AM
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SERVICE WRITER
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Found a TSB for updated rear diff. fluid (PN 12378514). Drain and fill with new fluid, drive in a RH circle for 5 min. then drive in a LH circle for 5 min. then drain and fill again.
Aug 16, 2009 at 9:27 AM