I had completly forgot about this. I was installing Warn shafts and CTM's this week. Thought I would share this little tirck a buddy of mine showed me a few years back. What you do is get a peice of PVC pipe that the OD is close to the ID of the axle tube. Cut a 1/3 wedge out of it. Cut it about 1 inch less in length that the distance from the inner axle seal to the end of the tube. Slide it in the tube. This give you a clean peice to slide the axle shaft on to istall it without dragging it through the dirt in the tube. It stays in the tube. If you break a shaft on the trail then you can pull it out and wipe it clean and not contaminate your Diff. The PVC also vibrates and keeps mud broken up so it comes out. The tube stays pretty clean as a result. This one has been in the axle for about 4 years now. As you can see it does not cause any issues. This trick works on a 10 bolt front. Don't know if it will work on a D44 since the tube walls are thicker. Same with D60.