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Originally Posted by Sammy
My personal method of checking suspension joints is to jack the car up having at least the rear, front or whole car jacked up (not one corner at a time) and using a rubber mallet start checking the joints. All the joints should be solid and should not make even the slightest odd noise. This is how I diagnosed a loose nut on my front sway bar. It didn't sound like much when I hit it with the mallet but it sounded awful when I drove the car. Once I torqued it down properly the noise went away.
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Rubber mallet wont work on worn bearing cartridges. Mine made slot of metal chatter but wouldn't make a peep when hit with a mallet. I know from personal experience on that specific issue with that control arm on the front and rear if the car. 70k miles is about right for the failure point on the bearing cartridge for the upper control arms.