I'm not having a go just saying look at the evidence.
Kit rings are hardened and ground.
No one else has come on to this thread to agree that they are soft.
There is only one suggestion of an alternative.
I know lots of Losi 22 runners with ball diffs and not heard of any problems.
So doesn't this suggest that there is not an inherent problem with diff rings and that the problem with your car is something else?
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