Mini-Z Box Stock Racing Series Part 5: Gear Differential

Just started Mini-Z racing? Trying to get your box stock fast?
This series will help you get your MR03RWD setup dialed.
Part 5: Gear Differential
TL;DR: Greasing your diff will turn it from an open differential into a limited slip differential.

[@Slacking02]

Why did you use the 15k over the 30k?

[@AMM0394]

There was still diff action with the 15k. Need thicker? Or more?