Rotpup,
I would agree that you have a bent tie rod. I did that to my 7500 a few years ago...had a loader full of rocks and I drove over what I thought was a rotten log - which was not so rotten. You can remove the tie rod pretty easily. I whacked it with a sledge until it was properly shaped. This is a bit of a pain because you have to keep checking it by putting it back on the tractor or at least holding it carefully in place to see how aligned it is. As zz said, you want a slight toe in of both wheels.
ps - The sledge whack technique is probably not the recommended approach but it worked fine for me and I have never had any other problems. Good luck!