I had my truck at the dealer getting other warranty work done, and it had a slight pull.Told them to check the ball joints. They told me they were fine just needed an alignment. Since my crew cab wont fit on my alignment lift I told them to go ahead and do it. Still pulled when I got it back so I checked them myself, left side was shot and right side was not too great. This was with 33K miles on the clock. My point, trust noone when checking them but your own eyes. Replaced them with MOOG and got new seals from ford, been great so far.