Question about 2002 Chevrolet Blazer

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Whining when accelerating

My 2002 makes a whining noise when I accelerate. It gets louder as the vehicle warms up. The SF is telling me the rear differential needs lubrication. How do I do that?

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IT COULD ALSO BE A BAD U JOINT IF THE REAR HAD NO LUBE IT WOULD BE JUNK BY NOW

Posted on Sep 29, 2008

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Posted on Jan 02, 2017

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You have bearings going out something. With the whining off. See if you have any noticeable play in any of the pulleys.

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Noisy rear diff or bearing any advice?


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1 Answer

Noise in rear end


Provided that this is a rear-wheel drive vehicle, there are a number of things which can make noise when you accelerate. Most are due to excess clearance in moving parts. This means some parts are worn out.

On the outside, the U-joint next to the rear differential can be worn and make noise. Inside the differential, usually a pinion bearing(carrier bearing) can make a noise like a whine or growl depending on the gap.

Now in the axle tube, the axle shafts have a bearing on each wheel. Like any bearing, when they wear out, noise usually indicates failure.

When Torque is applied on acceleration, the parts shift creating noise. If you have a Limited Slip Differential, there are clutch plates which have a material which can wear out. These types of rear ends also need a special Additive to make the parts work. Sometimes you get a clatter when the additive is low.

Have the U-joint checked first as it is the only external part to check. The rest will need disassembly.

Please rate my info.

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Check condition of rear differential oil.

Jack vehicle off the ground and run. Identify origin of noise.

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