That joint is not repairable. It comes as an assembly with the lower shaft. The steering shaft is in two peices. However, especially in 4 season states/provinces they become fused by rust. It is sometimes very hard to separate them. The fact that they are fused causes the u-joints (particularly the bottom one) to fail early due to frame flex. If you can get your top and bottom shafts separated, I have a good bottom shaft. If not you will have to buy a used replacement (I did this), buy a new one from Crown (cheap crap), buy a performance one from 4WD or Quad for $250, or get the OE.
If you are in the Windsor area we could meet. I am in Ann Arbor so not far from the border. If you come to the states, feel free to PM me if you want to arrange shipping something here to avoid added shipping charges, etc...
1994 Wrangler YJ
31x10.5x15 BFG MT