[E-Revonut]

Cheapest way out is to just get a ring and pinion as that is most likely all that is damaged. To upgrade the gear to something better you will spend about $200. The only way to do it right really is to get the FLM hybrid bulks ($75/each for front and rear) and they use 1/8 scale diffs that you can pick up for about $25 each. I have bought complete stock diffs on ebay for about $20 though. You can upgrade the diff cup but they really aren't the weak link IMO. It really is just a weak gear with big tollerances in the manufacturing process. Onlt time I ever had a problem with any of mine was when running 6s or running new pin type tires on ashphalt, when new they grip like crazy, they just wear out fast.