I'm at the point where I'm about to start building my rolling chassis so I'll be refurbishing the parts from my donor car. For the suspension there are obviously new parts in the form of springs and spax shocks, for the other parts I plan to clean and paint them and fit new bushes. My biggest concern is the back axle. The donor I bought was in a non running state so I have no real idea as to the condition of the back axle. I could just take it for re-conditioning anyway but I don't want to spend money unnecessarily, so I thought I would remove the rear cover and make a visual inspection of its parts. A visual inspection of the outside can tell me if there may be leaks. Is there anything else I can easily check to get an idea of its condition? for example endfloat, back lash etc.