I have an unidentified squeak coming from the center of the Colorado. I took it to the dealer who checked, driveshaft, U-joints, exhaust, mounts, guards, ....etc...etc. Stopped at local garage the mechanic trhere has on 06 Colorado. he says his does some thing. Does anyone have an idea on what it could be or have it happen to them??????

05 Colorado, 40,000 miles, squeaks from 0 to 30 mph.