I didn't like the gear diff in the front with lighter oil. Even 80k made the front inside tire unload and caused the car to push on power and made it lazy in fast transitions. With 100k in the front, it was a different story. The car pulls hard out of the corners, transitions well and has more steering into the turn. My rear gear diff with 10k is starting to wear in very nicely. I tried 20k in the rear, but gained more steering with the 10k. I'm getting some 120k to try out like Marcos' setup, but until then, I'm happy with the way the car is performing.