Quick question. I just bought the gear diff (and case) to experiment with.. Is the gear ratio the same as the ball diff? Also, do you all recommend using the Assoc black grease, AcerGoo sytnetic grease, or diff oil? The track is a very high bite, indoor clay that is very well maintained and now that it is winter, very cool inside. The current track config has a quad, a triple, 3 doubles, steps and a steep sharp hairpin. thanks