check the play in those stabilizer bar links. There should not be much! Those bar links are only $12-20 even from the dealer and they are easy to install. Mine is an '02 2WD I would hope yours would be the same. I am not a mechanic but it fixed my problem, having those replaced. The dealer told me that this is a common problem and these wear out frequently. Mine had around 51,000 when they went bad. Hope this helps....