I have a Diff from a turbo model at home, not sure if its s4 or s5 but I do know its a turbo unit. I want to know if there is a way I can test this to make sure its functional? The physical appearance looks good and the half shafts both spin in the same direction along with the mounting part for the drive shaft (can't think of what its called at the moment). After sneaking on here and searching through 9 pages I decided to make this post and get back to work before I get fired lol. Hopefully someone can help me out.

Thanks in advance.