Tie Rod Diagnosis

[55 Fargo]

Hey all, going to give my front end a once over, I think the king pins are okay, very little play in them and they take grease no problems, the tie rod ends seem not too bad, the 2 on the pitman shaft seem to have a bit more slop than what should be.

Which is the best way to test the tie rod ends for wear, and when is it necessary to replace them........Thanx Fred PS in about 3000 miles, do not see any unusual wear pattern on the tires