Wben I put new king pins in I had a tight one on the driver's side. I thought it would get looser with use but it actually got worse. Almost impossible to steer. I talked to an old timer who told me that the very tight tolerance of the new king pins was not allowing grease to get in where it needed to. His solution was to jack the truck up and turn the wheel all the way left, grease the heck out of it, turn the wheel all the way to the right, grease the heck out of it, then set the truck down and do it all over again. It took 2 or 3 days of this but it finally loosened up and works like new.