Suspension Noise problems of the 2012 Ford F-150

While driving there is a noise coming from the from suspension around the wheels that sounds like running over rumble strips. It is an ongoing problem that occurs on and off all the time. The mechanic says it is something in the 4 wheel drive components.

Makes clunking noise when making left turns, especially when steering wheel is turned fully to the left. It doesn't matter if its going forward for reverse. Seems like noise and vibration is coming from right suspension.

I hear a thunking noise under the front suspension over bumps in the road. My first reaction is it's a brand new truck. It sounds exactly like a bad sway bar link. So I took the truck to my friends mechanics garage and noticed front tires are cupped badly, an unusually wear for a new truck. We rotated the tires and checked suspension. We noticed what we thought was a bad inner tie rod cause there was loose unusual movement side to side with the tire on driver's side. So I went home and started to read on f150 forum. Com and found many people with 2011-2013 f150 year truck is having the same issue of thunkin noise. It turns out it is not tie rods, it is a bad steering rack and pinion. I read alot of information and a video of a truck that sound like mine. I have read where a service writer mentioned that 2 trucks lost steering but there was no accident and the steering racks were replaced. I have called Ford service recently and they said they know nothing about bad steering racks. Many owners of these trucks have posted in the forum that Ford knows of these so called contaminated steering racks that were made. I would like a TSB or a service bulletin that would get these bad racks off these trucks. Thank you.