Is there a upgraded pinion gear for Kraton 6s

[SLiM2775]

Hey everyone I own a Kraton 6s and I broke a tooth off of the pinion gear. So my first question is can i run the 14t gear on a gravel parking lot? It says not to use it off road in the manual. Also is there any upgrades for the pinion gear? I'm a newb in the RC Hobby so any advice would be great.

 

[Automag]

I've ran a 16t off road you just have to watch your temps.