My truck is completely stock. At about 9k I noticed the steering loosening. At about 11k I could turn the wheel between 11 and 1 and the front wheels didn't move. Went to the dealer with PIT5501D in hand. They said it had been superceded by 5501E. They did the locktite fix (5501E). It's been a couple thousand miles and so far so good. The existence of 5501F has dashed my hopes that the problem is permanently fixed. Now I'm back to waiting for it to loosen up again so I can take it back for whatever the most current PIT5501 happens to be. If someone could get their hands on 5501F that would be very helpful.