Alex, The problem with the diff. in the junkyards is they all have 80-120K miles on them and they need to be rebuilt. I am on my third and it needs to be rebuilt/re-shimmed too. So, I see an opportunity to teach (Prof. Bill in front of the class) and or provide services to the Galant community. May I suggest Prof. Bill provide some evening/weekend adult education to a youthful group who could bring notebooks, cameras and even a few Diffs to work on? Of course, I am sure there would be some fee to join the class, that would be expected. Each student could bring his own lab materials; seals, bearings, shims and a victim to work on. I know there are several willing students in the area who would sign up for the tutorial.