Coupler seperation

When I first dragged home my car I replaced the steering box and had a ***** of a time getting that coupler off! I finally sprayed it with a GOOD quality rust penetrant (remember the old Mopar thick grey foamy penetrant? In the blck,white,& grey can? Best stuff ever made...) and I let it soak for a day, then I went after it with a 4' pry bar and a dead-blow hammer. Sonofabitch fought me all the way, but it came apart. And if that drift pin is seized in there forever-tight, drill it out and peel back the remains.

And eventually I replaced not only the steering box, but the coupler & column too....