Last night my car was getting noisy so I pulled it all apart to inspect some stuff. I just got done taking apart the rear differential because thats where it was realy noisy. Anyway it was pretty much bone dry. In the directions it says to fill it halfway up the spider gear. Does this mean that I fill the differential halfway ?? Won't oil come out of the front bearing where the cush drive is ?? Also I don't have any Traxxas oil. Is there another oil that you guys use that works just as good or better ?? I was thinking TRI Flow. Or is that too thin ?? Thanks in advance !!