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On my 2011 Mustang GT the rear passenger side wheel sounds like it’s chirping and squeaking when driving. A few things leading up to the sound Ford dealership resealed the differential. The tire pressure light came on and I refilled them with air. Shortly after that I started hearing the chirping sound it was moderate at first but has grown to be very persistent. When I take it to a mechanic and they get it on a lift, take the tire off and inspect the brake caliper and wheel bearing they don’t notice anything that could be causing the sound. When it gets back off the lift the sound stops for the first day or so and then starts back up again. Has anyone had this problem before?
 

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Does it make noise only when hitting bumps? Is it constant noise? Is it dependent on certain speed? Worse when cold?

I think a little more info is needed.

But my very first guess would be sway bar bushings, second guess would be LCA bushings.... assuming noise only happens upon chassis movement.

If noise happening even on smooth road, then need to focus on hub/brake.

Good luck
 
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