I found the YZ10 diffs are really good. They are very similar in ways to the Tamiya 501X diff. Personaly I run ceramic diff balls and they easily handle low turn motors.
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Vintage R/C nut. 
Reliving all the good old days of r/c from the 80's and early 90's.
-Jason
***always on the hunt for vintage KO ESC's***
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