Originally Posted by alcyon

About 3 months ago, i bought some ceramic balls 1/8" for my ball diff on ebay from a seller from macau. at first they ran really great, my diff was really smooth. But lately i felt like there is something wrong with them, as if the balls have worn down in diameter, causing the diff plates to touch the diff housing, intstead of the balls seperating the diff plates apart. i tried flipping the diff rings to the unused side but seems to be the same. i tried measuring the balls on a caliper, but cant get a super acurrate reading cause my caliper isnt digital. 1/8" is 3.125mm
then i installed back my old carbide diff balls, which are at least a year old and ferequently used before , and the diff rings dont feel like they are rubbing the pulleys anymore. i wonder if there are fake ceramic balls out there, that are made of different materials that doesnt magnetize and is black in colour, or perhaps these balls are ceramic but of lower grade hardness?
Any experience you guys have with ceramic balls quality issue, please give your experiences and 2 cents worth.
Thank you.