I used a MAPP gas torch, (2) two pound hammers, two pipe wrenches, a 3 ft cheater pipe, 2 cans of PB Blaster, and a vise.
It took me about four hours of heating, beating, and twisting to get both ends out.
I would heat the collar as hot as I could get it with the MAPP torch, then use both hammers at the same time on opposite sides of the threaded tube to impact the tube and break it loose.
Then I would spray PB Blaster on it to cool it and to lubricate it. Then attempt to twist with two pipe wrenches and a 3 ft cheater pipe.
I've done a lot of tie rods in my time, and that one was probably the hardest.
Since then, I have well coated the threads in copper anti-seize and filled the slit gap with grease in order to keep water away from the threads. It moves easily now.