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Re: Squeaking noise while driving on rough of uneven...
Check for dry/worn rubbers on the suspension, stabiliser bar, shocky rubbers , dry/worn ball joints
if you have fitted polyurethane bushes instead of rubber , they will be loose on the suspension bolts.
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this will take hands on test by a mech. we can not do that here, we can not do the tests, or look or wiggle things. to find it. we use a cheap electronic ear test device, to find noise and that is hands on too.
you most likely just need a good old fashioned lube job. you have fittings in various places that need to have a grease gun used on them periodically to grease different areas of things like the suspension etc.
Beyond the issues of dry wheel bearings and CV joints, various points in the suspension (front and rear) have rubber pivot points that get squeaky when moved. Try pushing down on each corner of the car to try to locate the area of the noise. Is it worse on rough roads or smooth? Make sure that all of the lug nuts on the wheels are tight. Lastly, doors, hood, and trunk lid can squeak if they move while driving. Silicon spray lubricant works on all rubber surfaces. Wheel bearing grease works on wheel bearings and CV joints--look for wear and replace any damaged part.
I'd lean toward bushings of some sort. Inspect the control arm bushings for signs of cracking, and check the sway bar endlink bushings for wear and tear. Both of these parts are going to be worked harder on uneven roads than they will on a smooth freeway, and are likely candidates for causing your problems. A third possibility would be worn strut mounts, but I'd look at the control arm and swaybar bushings first.
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