I put one in my K5. It really tightened up the steering. Gave it a much firmer feel, not mushy. There are plastic bushings in the shaft that have to be melted so you can adjust it to the right length. Some people also weld up were the rubber damper is. I am going to swap in a new steering gearbox on my K10 and it would be a good time to go ahead and swap in the XJ shaft.