I bet the sound is still there when you get faster. The road noise and such covers. I had all the groaning and creaking. Ended up being ball joints. Might be a good place to start the search. Also look at the bushings under there. Miine is a 4x4 and that is what it took to fix it.
WARNING.... I am not a mechanic nor did I stay at a Holiday Inn Express last night. This is just a guess from what I have seen with mine.