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Rear Noise

Noise in rear differential

Rear Noise

Postby 199Sierra [OP] » Apr 14 2012, 1:05am

I'm a newbie to the forum, just upgraded from my s10 to a 99 Sierra. Today I opened the rear sliding window because it was actually nice and noticed a whining coming from the rear truck. I checked the Dif fluid when I got home and it was low so I topped it off, but the noise still continued. Is this a common issue ? I know its not the transmission because that was just rebuilt 800 miles ago. I'm hoping its something simply like U-joints but I've only experienced them squeaking and clicking. Suppose I'll drop the cover tomorrow hoping I don't find any big chunks.
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Re: Rear Noise

Postby ASTE25 » Apr 14 2012, 6:17am

You are probably just hearing the rear end making noise because the sound is not muffled through the bed and open slider. Rear axles make noise, some more than others. It it's just a whine, it's probably nothing to worry about.
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Re: Rear Noise

Postby GMCFanatic2010 » Apr 14 2012, 9:17am

if you have any maybe check your grease zerks make sure everything is greased up the right way
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Re: Rear Noise

Postby EKinMN » Apr 14 2012, 12:53pm

Or, could it simply be tire noise?
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Re: Rear Noise

Postby 199Sierra [OP] » Apr 14 2012, 3:39pm

Okay, thanks for the help. I had a Tahoe two trucks ago and the rear end went, very costly repair.
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Re: Rear Noise

Postby ASTE25 » Apr 14 2012, 7:23pm

If you notice it getting louder or changing, then you should maybe get it checked out.
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Re: Rear Noise

Postby Rebel842001 » Apr 14 2012, 11:10pm

When I worked for a dealer I did a few rear ends the bearings start to loose the chrome coating on them and start making noise. Its not an uncommon problem but without hearing the noise myself I couldnt tell you what it is. Could just be normal noise then it could be bearings are just starting to go out and havent got loud enough to hear with the widow closed. All rearends ive done were making noise while under accel and cruising and would stop when you let off gas and go to coasting, maybe that will help narrow it down if it gets any louder on you
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Re: Rear Noise

Postby 199Sierra [OP] » Apr 15 2012, 1:15am

I have a feeling that it is something, today I noticed that the faster I drive the louder it gets. I dropped the cover and replaced the fluid, no chunks or anything concerning. I think that it could be the bearings or needs to be shimmed or something.
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Rear Noise

Postby Machster69 » Apr 15 2012, 1:43am

Bearings
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Re: Rear Noise

Postby Rebel842001 » Apr 15 2012, 1:48am

I never shimmed a newer model rear end. There are only two spacers on the ring carrier and they are the same thickness so you cant shim the ring gear closer or futher from the pinion. Only real shim is on the pinion to set the pinion depth. The factory does a good job on getting that right so I never had to check pinion depth just pressed bearings off and new bearings on. Its just me but if I cant hear it with the windows closed I wouldnt be to concerned about it just yet
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