I have a 2001 GMC Jimmy, 4dr, 4wd, 4.3 vortec engine, Automatic. I have this anony squeek coming from the front drivers side wheel well. The noise is onlypresent when i hit bumps or if i rock the truck up and down. I have re-greased the ball joints, sprayed lubercation on each rubber bushing and i can not see any bushing that may be bad. Does anyone have any ideas on this one. Thanks!

 

You could check if your valance or bumper is loose on that side. Just an idea.

 

My 97 Chev Blazer did this when I first got it. In order for me to certify it and get the ownership transferred over it required a swing arm on the drivers side as well as both lower ball joints to be done. I'm betting that it's probably your swing arm that is causing the noise.