1999 Chevy Astro rear differential

1999 CHEVROLET ASTRO
162,200 MILES • 6 CYL • AWD • AUTOMATIC
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CHEVYASTRO
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when i drive my van . i get a humming sound from the back. i notice when im driving an ready to park or make a u turn i get a vibration from the front wheel and the back like theres a grabbing . what u think it is
Apr 10, 2009 at 8:16 PM
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MHPAUTOS
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Hi there,
Normally you can tell a diff whine by backing off the throttle and it changes pitch, wheel bearings normally just get louder and softer with road speed. as for the grabbing, i would have all the transmission oil levels check first.

Mark (mhpautos)
Apr 10, 2009 at 8:49 PM
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CHEVYASTRO
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would u think its best to change the back wheel bearings . when i service the rear it looked good
Apr 10, 2009 at 8:52 PM
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MHPAUTOS
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Hi there,

I would only be changing the bearings if they are noisy, is there any play in the bearings, is the noise constant with road speed can you get the pitch to change by backing off the throttle, try and identify some of these symptoms first and report back, just changing the bearings may be an expense that is not required, but if you feel that it is the wheel bearings then do it.

mark (mhpautos)
Apr 10, 2009 at 11:18 PM