jr_ss wrote:Wheel bearings have been known to make the squeak as well. My truck did that too, I took it to a mechanic and he said that the wheel bearing wasn't packed well enough. You might want to try that as a possible option as well.
I don't think the wheel bearings squeak when compresses at the bumper.
It's probably your coilovers. Mine squeak all the time, but it's the least of my worries. WD-40 might help, but you can also get a rubber hose that goes over the spring. It's essentially a bushing that stops it from squeaking.