Pretty sure the shafts are made of hardened alloy steel, machined from a solid piece. If there was a welded seam then it would only take a couple installations before the taper would begin to fatigue and separate the shaft at the seam.Thinksno said:Ive seen them crack on faces not shaft. The shaft must be made of seamed tubing and I think the seam is what you are seeing. I'm not sure what would happen but it does not look good, can you see a mark on end of shaft- the seam may not be fused properly? I would go to dealer and see if Polaris will help you.