I use a large pair of mole grips on the track rod - if there are no spanner flats - to hold it and twist the track rod end off. If it won’t budge then apply heat, but too much will wreck the rubber boot.
John
How hot are you getting it? Maybe it’s been fixed with locking fluid which holds things ferociously tight - but plenty of heat frees things. I use a mapp gas cylinder and torch.
John