Whenever my fc goes over bumps (Speed bumps is a prime example) there's this nice creaking sound in the back. My dad said its some bushing in the rear suspension, he lubed them, it stopped for a few months. He said replacing with the OEM bushings would result in the same issue, after they get hot/cooldown after a few months.

Anyone know what this is and if I can get it to go away? It's really bad since I got the front upper strutbar and is getting pretty annoying

thanks

 

"Creaking" is the result of metal on metal contact, which would indicate that whatever bushing is the cause needs replacement, not lube.
The OEM units will last far longer than "a few months" but may be more compliant than you desire...depends on what you want from the car.

 

strut mounts

 

struts or suspension bushings or IIRC the rear subframe mounts.

 

do you know what bushing ti is, you can always try some polyurethane ones

 

Check the rear camber link (on the rear control arm, forward, inboard end/pivot) on the side making noise. I have a similar annoying creak and traced it to that link. I would think a relacement oem bushing would outlast a polyurethane one since those are known to be noisey/creaky if not properly lubricated or the grease drying out.Regardless, if that link is the actual problem, you are pretty much stuck with a OEM replacement, unless you opt for AWR- "adjustable links". The problem with oem bushing/suspension stuff is that parts are expensive.

 

I had an identical problem, it ended up being that the previous owner put the sway bar endlinks the wrong way and it was rubbing the wheel well.