I have looked at the pictures over and over again, and I can't figure out what ate up the threads next to the splines, they are lower than even the chewed up part of the splines. Were the splines in the tracks not matchined to match perfectly to the splines on the axles and they finally chewed up both parts? Was the axle nuts properly torqued, or did they work loose? This is baffling to me, and I really think that Kubota is going to run backward on this one, don't know as I would blame them till a lot of questions are answered. Those parts should not have failed and like said before, should be capable of transmitting all the hp no matter what is connected to the ground. I'm thinking it was either the machining in the track hub is not corrrect, or they were not tightened properly. Hope you find the answers and let us know.