Hold one end in a vice and loosen the lock nut. Look close at the thread pitch. Might be left hand threads.
WD-40 ....BLOWS for the stated purpose. Are other products better? Sure. PB Blaster is phenomenal, try also Liquid Wrench and other penetrating fluids. I don’t buy WD-40 any more. It’s way overrated.
The nut there is a lock nut. Righty-tighty, lefty-loosey. Loosen that, and the helm join end can also be unscrewed. Are you using a vise?
EDIT—I’m slow today.
Anyhoo, every proud man must own a propane blow torch. Works wonders.
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Squirt it some more. Let it sit. Try again.
A torch helps break the rust bond.
Your getting there.
I'm definitely going to need some new tie rod ends after this haha
Fire man fire!
Heat it red hot!
YEAH! PB Blaster!!
Believe you me, we've all been there before, waiting for the fluid to work.
Have you positioned the rod vertically, so gravity pulls the fluid in the direction it needs to go?
EDIT--maybe not so much red hot (he was exaggerating, I think), but you want to apply the blue torch flame to the outer piece so it expands--away from the threads. Quickly though, so the heat doesn't transfer to both parts, expanding them more or less the same amount....
YEAH! PB Blaster!!
Believe you me, we've all been there before, waiting for the fluid to work.
Have you positioned the rod vertically, so gravity pulls the fluid in the direction it needs to go?
EDIT--maybe not so much red hot (he was exaggerating, I think), but you want to apply the blue torch flame to the outer piece so it expands--away from the threads. Quickly though, so the heat doesn't transfer to both parts, expanding them more or less the same amount....
...But I believe capillary action/attraction force will do the trick in any position, as far as the application of nut busting juice goes.