I keep going through the shaft from the carrier to the differential. One I beat on a rock at tuttle, the next one was twisted off pulling a tractor pull sled when the first 454 had a turbo and made 950lbs of torque, the next one was smashed in half on my bachelor party. I have one in and one as a spare right now. I just keep collecting them because from the carrier to the diff is the same on subs and all of the pick ups I have found. There is 2 different splines on the slip yoke part. I would use the fine spline if it was me since the course is harder to find and that is what I have. Should be easy to come by. I just need a real nice machinest type to make me one out of sced 160 or something light like that.