if I were you Id pull the tie rod down (out of the knuckle) & look at the hole & see if its realy out of round
the taper on the tie rod is definatly harder than the knuckle I have seen this happen the ball joint or tie rod nut isent tightened enough or the installer backs the nut up to line up the kotter pin hole with out breaking loose the taper again & the taper fit pops loose & works it self real loose sometimes if you catch it quick enough you can re tighten it & all is well but only after looking at the hole to see if its round I have seen the nut kinda mangled & the hole all wallered out & the taper on the joint be fine. but check it anyway.
if its round just tighten it up good & tight but not too tight & never back the nut up to line up the cotter pin unless you break loose the taper again & re tighten it (to line up kotter pin only turn the nut clockwise)
if you have to replace the knuckle get a used one dont wory about a new one
the tie rod end is prolly OK just look at the taperd part near the threads & if its not obviously screwed up put it in tighten her up
heres how you check tie rod ends wrap your hand around the joint & nut try to compress it if you cant compress it & you grab the wheel & try to toe it in & out & you see no play in the joint its fine
good luck
JAK
PS
put a floor jack onder the lower controll arm on the suposedly bad side jak it up so the wheel is just off the ground het you a pry bar & try to pry the controll arm away from the knuckle both upper & lower if there is little or no movment your ball joints are ok also grab the wheel top & bottom push in on the top while pulling out on the bottom & vise versa & feel for play
take care
JAK