Differential gears this is what happened to the last set

[Ajc1977]

This is what happened to the last one

 

[JCsRCcar]

If you are using that self righting feature then I would not use it anymore. The back and forth shocks the gears and strips differential or gear teeth. Looks like rust too. You driving that thing in water?

 

[NitroR/C]

There has been no maintenance of these components: a liquid corrosion, I think water. does not look like a mating error or normal wear and tear of a sprocket.

 

[nino]

Did it fall into a vat of acid!?