Ceramic balls and Associated Black Grease have been necessary in the Losi cars since the XX. I wouldn't get too worried about it if you never noticed the problem in the older cars.
I personally prefered the keyed diff rings in the XX. I copied the traxxas TRX-1 build and glued mine down for years. Recently I've reverted to running a file around the outdrive and diff ring - seems to work fine.
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