If there's half shafts on the front, you might suspect an axle seal in the differential housing. Dousing the area with a spray-type lubricant will quiet it for a few hours to a few days if it works its way in there behind the inner cv joint.

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.

Answered by caradiodoc (expert)
17,280 answers provided