anyone? what center diff oil should i use? and what weight shock oil?

edit-
I just got off the phone w/ S&T.. They told me that they couldn't tell me what the part is, and wouldn't ship me the component for me to switch out myself..
To have it sent in, to get looked at, it'd be $25 minimum to have it tested, and then $7 or so for shipping. and then whatever they would charge to replace anything that's damaged. They also said if I wanted a new controller, I would get 1/2 off, if I sent the controller to them..
SO.. I suppose I'll just run it until someone figures out what the component is.. and replace it.. for now, I'll just run it like always.. if it goes up in smoke, I'll send it in, and think about getting a new one at 1/2 price.. but 1/2 price is still $140.. and no one knows how much the tekin or castle controllers will cost, but will most likely be better controllers..
I asked if he could tell me the part number of the component, just out of curiosity, and he said he didn't have the technical details of the controller... lies.. :019: