I replace the oil with Hy-Tran Ultra anytime I change oil in the rear end oil. Hy-Tran Ultra has an oil encapsuplating properities in the oil. All Cub rear endsare not a sealed unit....meaning moisture can and will get in them. This is a good example of moisture in the rear end:
I haven't put a load on this rear end yet.....hope it is ok.
This is the rear end in my "Project Uncle Dick 70"
http://www.onlycubcadets.net/forum/s...ead.php?t=1270