Hello, I just had a new transfer case put in the rover by a shop that was doing some other work on the truck as it had been broken into. When I get under there to look i can see some oil leaking from the point where the transmission output and the t-case meet. So I need to go back and get them to redo the whole thing, so my question is since they dont seem to know much about rovers is, is there a gasket that should go between there or just rtv?