If this is the problem, then from time to time you'll need to have someone move the Steering Wheel back and forth while you hold, or place a finger, on the TRE nut to see if you feel any movement. The TRE stud, or shaft, could've (probably DID) wore the tapered hole in the Steering Knuckle. Most likely
not necessitating a replacement of the Knuckle, just a need to keep an eye on it becoming sloppy from time to time. "IF" it is worn really bad (where there is a slight movement when it's really tight), there is a "Sleeve" you can buy (it was about $24 shipped the last time I ordered it) that can be installed (and welded) and you'll be good to go.
Jack
PS: I wasn't getting in ur case about ur Vagueness, but there is a "nice" middle ground between NEI and TMI...