Strange Noise and Vibration
I have a 2001 F-250 Super Cab w/5.4 V-8, 2 WD with only 9000 miles. I have an intermittant noise and vibration that is driving me nuts. When taking off while towing (and occassionally when empty), a loud "rattling" noise and vibration seems to come from under the truck. It is similiar to a fan blade hitting something or the muffler striking the frame. I have taken it back to the dealership twice, and of course, no noise can be heard. They have checked the engine mounts and muffler. I have gotten under the truck and can find no possible source of the noise. I tow a camper and the problem is very bad when first taking off or when the truck downshifts to pull a hill.
Has anyone ever had this or a similiar problem? Any help would be greatly appreciated. I want to get the problem fixed while the vehicle is still under warranty and before I am away on a camping trip and get stranded.