It could be the upper ball joint nylon bushings, I changed mine this fall. it was a pretty easy and cheap fix. The little nylon bushings in there were turning when i was turning when they are supposed to stay put, and it would bind up my steering sometimes, but not bad enough that i could still jerk it back, it also made my tires wear funny. but i put new ones in and it fixed my problem along with the tire wear. My steering is still plenty loose and wanders sometimes, but i need to adjust my steering pump or just get a new one.