No anvil but i have a 2lb hammer
OK .... use a sledge hammer lying on the ground then. Work on top of that.
It works even better if you can have a chum hold the sledge hammer handle so that the head of it is standing on end, and you can work on its end. It's a question of optimising inertia and momentum, but who cares as long as it works?
Lay the track rod flat on the "anvil" of the sledgehammer head and bash it down onto the sledge-head all round not too hard with your two-pounder, turning it a bit every time you smack it Work along the so you have bashed all the stuck area. .
You can be quite sure this WILL loosen it and take it off.
A real anvil is good - 350 pounds of solid steel. Great for bashing things on.
You are gently "forging" the outer threaded tube down onto the threads of the trackrod so no damage is being done, but in the process you are breaking up the rust and corrosion into a fine dust and breaking the bond that sticks the caboodle in there.
Always works for me. Just take care and don't use brute force.
CharlesY