2005 F350 diesel dually 4x4 King Ranch. Front end vibration when turning the wheel to left. Going forward or in reverse. Doesn't happen all the time - about 5 times in past 4 months. Almost a grinding vibration. Ford can not find problem. Any suggestions?

 

I have had this noise when turning left or backing up hill in my 95 and it has gotten progressively worse. Something was moving around. The exhaust was rubbing on the firewall because the cab body bushings were totally compressed which reduced the clearance. Before realizing this replaced the motor and transmission mounts, improved the situation but still had the noise, only when replaced the Cab Bushings did it stop. 95, gravel roads and 430,000 miles - lots of wear and tear. No noise, rides and handles better. When you buy parts spend the extra for replacement nuts and bolts.