Hello, I just fitted the KCA313 front roll centre correction kit to my MY97 JDM Impreza STi.

Removing the old ball joints from the hub was a challenge, however sliding the Whiteline ball joints into the hub was very easy, but I was concerned that the Whiteline ball joints are a very loose fit inside the hub.

I could actually move the ball joint around while it was in the hub, this was of course without out tightening the retaining bolt but I am not sure if this is normal as the old ball joints did not move at all even with the nut removed and putting the old ball joints back into the hub required a bit of pressure to be applied to slide them in.

Is this normal?

 

No, its not normal. It should be a snug fit into the knuckle. How old are these? There was an early batch of mismanufactured roll center kits that were slightly smaller in outer diameter than what was originally intended. They started to develop a bit of play between the knuckle and the ball joint. Do you have pic of your ball joint?