Got to turn some laps last week at OCRC. Gear diff with 10k, white front/green rear springs with 35/32.5 oils. Very stable, but lots of push, and it nose dived a bit off jumps if you didn't keep some throttle on. Overall, it was good, but I've decided to go 3 gear and not mess with the 4. 3 Gear coming soon...
I will also be dropping the 10k down, I'm sure it was a bit thick..