High Pitched Chirp & Creaking Sound

[crazyone64]

On any type of bump on the road, from the rear passenger side, it gives off an annoying creaking sound.
Similar threads indicated it might be the control arm bushing or even the lower stabilizer bar being loose or needing oil in the bushing?

Another piece to add in, when i go over speed bumps, from the same passenger rear side, it gives off a fairly loud, high pitched chirp.

Are the two related?
Anything else I could check ?

[crazyone64]

I sprayed some silicone on the bushings, no difference.
Stuck my head under the car to try and isolate it while another person pushed down on the trunk.
Seemed to be coming from the wheel well.

After removing the interior of the trunk, I crawled in and found a more specific area where the creeking was coming from.
It is almost right beside the mechanism for the seatbelt. Where it is rolled up.
Beside it was a layer of padding, then a layer of what felt like styrofoam?

It was impossible to see from within the trunk.
Any ideas ?

[Con's Mach1]

That's a tough one. I had a roaring noise I thought was coming from the Passenger rear, but wound up being the FRONT TIRES! Sound travels. I'd check other areas. It sounds wild, but it's true. Unless you know for sure it's in that area. Or it may be the Brake Caliper or Pads. Wish I could help more.

[NightOfTheCow]

My brakes tend to make chirping noises over bumps when the pads are worn down really good.

[RAT]

The pictures are gone but it sounds like you were looking very close to where the problem is. From their description, you should find it easily.

http://www.mach1mustang.org/vbulleti...ead.php?t=4378