Took it to the dealer this morning they didn't see a problem. They fixed the pinon nut recall. Got to take it back next week the AC blower is making a ticking noise. So they got to fix it. Maybe a weight on the muffler I saw where someone put a thing on their muffler with hose clamps with bb's in it to keep the vibration from coming to the front of the truck. I have looked all over to find it. But I cant find the post.