Whistling Truck
I have actually read a similar conversation a long while back but not sure in which forum, tried a search here but unsuccessful. So, I took the newly delivered truck (Sierra 2500) for a break-in ru...
Forum Discussion
Check the trim around the front windshield. With my bug deflector on my truck it caused a whistle tapping noise at highway speed. I taped around window and outside, and filled slight gap with black caulk. No more noise.
