First you have to consider that all the rubber bushings are old and dried out, the body sheet metal is fatigued, the ride height has sagged from aged springs, and some parts will have rust on them. Any of these things can lead to noises that weren't there when the car was new. While it may be true there is no safety issue involved, there's no way to be sure the cause of the noise won't lead to some other break down or problem later. I'd at least want to know what is causing the noise.
There is a tool you might be able to borrow or rent from an auto parts store that borrows them called the "Chassis Ear". It is a set of six microphones, a switch box, and headphones. You clip the microphones to suspect points, then drive around while listening with the headphones. You can move the microphones around to zero in on the source of the noise. Be aware that many mechanics have never seen or even heard of this tool. Suspension and alignment mechanics use it to find rattles, squeaks, and other noises.
This tool is available now on Amazon for about one third the cost on the tool trucks that visit repair shops every week, and there's a newer version now that has four wireless microphones and two still with wires.
Saturday, January 31st, 2015 AT 6:16 PM