Does the plow have skids on it? Is the front tire pressure equal on both the front tires and both the rear tires?
I checked the tires because one looked low earlier this week, but I was wrong, both are at 12psi. The skids are all the way up, no contact with the driveway. I put the rears both at 20psi when I put them on not too long ago.
I think it is the missing linkage that is causing it to turn.
Thanks every one for the help so far!