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Old 01-28-2016, 07:21 AM   #1
douglas92000
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2002 GMC Sierra/Mysterious Clunk/Thumping

Have been attempting to locate the source of thumping or clunking sound similar to that of bad shock, but too date haven't been able to pinpoint the source....so thought perhaps posting here might help.....

Have low mileage 2002 Sierra SLE that has a body noise that haven't been able to locate. The sound is similar to a bad shock....Replaced the front shock.....which wasn't 2 years old...and then the noise reappeared again....Have checked the wheels and motor mount...but so far no luck....It seems to be worse in cooler weather and is reproduced when driving over an uneven surface or hitting a bump....The clunk is intermittent...Sometimes you will get the noise driving over a bump....sometimes not......The noise seems to be originating on the driver front quadrant....but i maybe wrong....

Have had mechanic check the truck on a hoist, but can't find anything out of order...no tire wear...wheels are solid with no play...nothing out of the ordinary that we can see....Tried moving the body by hand..but can't reproduce the "clunk".....

Even after 14 years the truck is solid ...and no rattles or noises until now......Guess i'm just a nit picker...but would like to locate the source......Any ideas, suggestions or opinions would be appreciated.....

Thanks in advance
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Old 01-28-2016, 08:13 PM   #2
kdadeo
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Re: 2002 GMC Sierra/Mysterious Clunk/Thumping

It may be the caliper bushings, if it doesn't do it or goes away with light brake application that's probably it, over time they do go bad with age and with the weight of the caliper hanging on them, and its a cheap fix. Drive over a known trouble spot and apply the brakes a bit to see if it stops the thumping.
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Old 01-30-2016, 07:30 AM   #3
douglas92000
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Re: 2002 GMC Sierra/Mysterious Clunk/Thumping

Must have had a senior moment...Forgot that i had previously replaced the original intermediate steering shaft in 2010 with non-gm part to stop a clunking noise....It is a very common problem for some GM vehicles....Believe this will be the source of the clunking....

Thanks for your input.....
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