Back in the 1990's I used to race an original Kyosho Lazer ZX which came with a centre ball differential built into the spur gear. It was terrible - the power is directed via path of lowest resistance to the wheel with the least grip, meaning in extremes it would only drive 1 front wheel. It had poor acceleration so the first thing most racers did was remove it and fit a WASP one piece layshaft instead.
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