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It has probably already been mentioned, but I would drop the drag link and the tie rod, so the three main components are free to move independently. (each wheel and the steering box). I would then carefully inspect each of the three elements to try and identify the source of the tightness. Just take everything from first principles. don't forget the tie rod ends and drag link joints.
Also check for correct alignment of all the joints and look for binding.
Then reconnect the tie rod and see if the spindles are still freely able to rotate. Then put the drag link on and recheck.
Hopefully while going through all of the above, something will present itself as the cause of the problem.
It may be worth bearing in mind that the steering box on those models were not the best, hence the move to the roller sector design on the 37 models.