Quote »How do you tell if your diff is open of limit slip?[/quote]Any forum browser would tell you to search? Keep the forum a little less clutered as there are many posts with similar titles.
But because I'm trying to sell the extra LSD in my possession. Take the rear driver wheel off and look at the diff you should be able to see a sticker similar to this:
http://nico.dreamhosters.com/fs/DSC01572_res.jpg
If not you have an open diff. You could also check your rear tire wear for unevenness.