Hi Tim
I changed mine before the nationals and havent rebuilt the diffs all season. I only change the balls if the diffs still feel gritty after a rebuild. Its usually one of the balls thats chipped but its impossible to see which one it is.
Ive just rebuilt the diffs ready for indoors as a matter of course. I think people either rebuild them too often or run them too loose so they slip and wear the plates out too quickly.
i dont expect to rebuild my diffs again until before next outdoor season
I use the ceramics from RCLazy.
HTH
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