I have the worst creaking noise coming from both front and rear suspension units on my '04 SXT, going over speed bumps is the worst, but any road deviation will trigger it.

It gets much worse in the winter, and almost disappears if the temperature gets over 90 degrees (I'm in Phoenix, so that's half the year).

Sounds like the noise the springs in a rusty old mattress make when you jump on it, except about 10 times worse.

Any idea what it could be, shocks, struts, mounting brackets??

 

Sounds like rubber bushings. Get busy with a can of WD-40, and go for a drive to work it in.

 

Mine started doing this too about a year ago. It disappears in the summer, but it's really bad in the winter. I haven't had to replace anything yet though.

 

Wouldnt some kind of oil be better to use since WD40 actually draws moisture out, where oil would lubricate? I actually thought about oiling bushings on my suspension to try to loose that creaking noise over speed bumps...