you have a 2005, for which this seems to be a common problem. before anyone else flames you, I'll be nice: you should do a search on "bumper creak" or "creaking." check out this thread:
http://www.toyotanation.com/forum/t99796.html
its basically the area where the two pieces of aluminum of your bumper extensions meet. Toyota thought they could save money on the welds by only welding 2 of the 4 seams on each of these extensions. the metallic noise or "creaking" is what happens.
Good luck!
quote=redstu]Took my 2005 dc 4x4 to the dealer yesterday. My truck has started to make a metalic noise coming from the drivers side front wheel area when I go over bumps in the road The dealer can't find anything wrong, and will contact toyota for tech help.I did notice that while truck was on the lift, that the inside cv joint /cover seems to be very loose. Has anyone been getting this clunking noise from the drivers side wheel area?[/quote]