Just bought a 8 3/4 chunk for my 340. It is a 741 case. I have sprayed it with abunch of wd-40 and taken a small wire bruch to the ring and spiders. I will keep hitting with a bunch of wd-40 and let it drip. What else should I do? Any other things to clean it up before installing it. Do I need to grease everything once it is clean<? What gear oil is everyone using and how much?