I have a simular problem with my nitro evder, I keep breaking breaking the thrust bearing, then my diff does like yours and just slips.

I know its not from overtightening as I keep it relatively loose, aleins8mycow told me he thought it might be because I had it too loose.



The balls in your diff. are probobly the standard size, 3/32" diff balls, 1/16" thrust balls, but Ive seen other sizes so try to find out exatly what size they are.

For the washers, try to measure their inner diameter, width, and outer diameter, once you get those measurements you can get on tower hobbies website and just start comparing your measurements to that of all the other diff. washers.