just got my sc10 last week and finally raced yesturday. got it used with a cc4600 and it flies. I'm running and indoor carpet track with jumps, so very high traction.

my ? is... I have major grinding inside the tranny and have it narrowd down to the diff internal gears. I have a new diff kit ordered and then I was told some thing about the newer versions needed shims in the diff. what shims and where do I put them, and will the come with the kit??