So I've been looking through the different posts about curing the loose steering box on my k5. I constantly have to rock the steering wheel a lot back and forth to keep the truck in my own lane. I've had three different boxes (1 rebuilt, two used) in it all with the same amount of play in the steering (4-5 inches each side of center). All the play is inside the box, not the rag joint of the column. Tightening the small screw on top helped a tiny bit, but not much. I assume I have a fixed ratio box from 71 C10. It's a remanufactured 2wd version needed for crossover. Some posts say a later model gear with a variable ratio worm gear will feel tighter, but some posts on other sites say a fixed ratio box is tighter at the center when driving straight. What year do the variable ratio boxes start? It seems like '81 or so seems right since the part numbers change about then. It's just too scary driving down the road next to oncoming traffic to not try it out.