If you jack the front end of the car up so both tires are off the ground, then slowly let it back down, you will probably be able to see and hear the knock if it's a ball joint. Mine has the same issue on the right side, I had some wondering on the road and some pulling to one side. My right upper ball joint is bad. When letting the front-end back down, I could see the top of the tire move abruptly and a loud thump. I haven't changed it yet, just won't be driving 100mph and taking it easy until I do. I just wish Ford would have put grease zirks on the pivoting joints on the front end. Besides the ball joint, my front-end seems tight, but all the rubber grease holders seem dry upon inspection.
I hope this helps a little for someone.



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