Its true there shoould no play in them. It depends on how picky you want to be & what you are going to do with the truck weather you should replace it or not. Basicly they are pretty easy to replace but you can run into problems. Sometimes the kingpin is stuck in the axle & can be a nightmare to get out. Then its possible the axle is scored & the new kingpin fits loose in it. Then you have to ream it out & use an oversize kingpin set. I dont mind working on any part of these old trucks but the kingpins scare me. You probably have floating bushings in yours so the bushings will not have to be reamed. Hang on to those reamers. You cant buy them anymore. Some of the older cars had load carying ball joints with a certain allowance for play, But other then that no steering component should have any looseness. Like tie rod ends or drag link ends.