HELLO ALL, I HAVE A RTR AND I NOTICED I HAVE GREASE IN THE DIFF, SHOULD I PUT SILICONE? AND IF SO WHICH WEIGHT IN WHICH ONES?
Try the kit's diff lubes first, it's a good starting point. Also, make sure you stick to one brand of diff oil, so the comparitve viscocity is linear...translation, 1000 wt oil may be different from brand to brand(or so I'm told). Just get 5K for the front, 7k for the middle, and 2k for the rear. That'll be a good starting point.