Shmoo,
Getting the truck to steer properly and easily requires you to look at all the links in the chain and repair every link that is loose, worn or binding. I would jack up the entire front end so both wheels were off the ground. Lay on your creeper and start shaking and wiggling things starting at each front wheel.
Nothing should be sloppy or loose. If you can pull the drag link, you can turn both wheels side to side without the interference of the steering box while you check the king pins for binding. Whatever wear you find will have to be addressed. Hard steering, excessive play and wandering are signs of cumulative front end wear.
When everything is repaired, a front end shop should take a look at your toe-in, and maybe your camber. That's my take on it.
Stuart
