I suggest that you read my post again....only do it slowly this time.
Nowhere did I accuse the OP of neglecting this tractor. I simply pointed out that his complaint about hard steering is most likely due to neglect or abuse in one or more of the listed areas. This gave him solid information as to what could be the root cause of the hard steering.
Knowing where to look and what to look for will aid the OP in pinning down the true problem. On the other hand, your suggestions are nothing more than band-aid solutions that solve nothing. You accuse me of not knowing the OP. I accuse you of knowing little to nothing about Case GT's. Unlike you, I am speaking from the personal experience gained by helping hundreds of Colt, Case and Ingersoll owners solve problems with their tractors.
I suspect that the OP is more likely to be the 4th or 5th owner of this tractor. He has no idea as to how well his tractor DID steer when it left the factory decades ago. For all either of us know, he could have a kingpin close to seizing up from lack of grease. How would changing front tires undo that problem?
It's real easy for some people to come on these forums and tell someone looking for help to go and spend $150.00 on a pair of tri-rib front tires. And then when the OP finds out that the tri-ribs didn't change anything, those people just go "Oops, sorry about that." and then they move on to the next post where they can give out bad advice.
Those are my constructive comments about your post.