I remember the gear diffs in my old PB Maxima. The moldings were shocking and the screw that held the whole thing together kept undoing but I am sure that with todays technology they could do a bullet proof geared diff, just a scaled version of the 1/8th diffs would be nice so we could tune them with thick diff oil. Trouble is that the ball diffs are so light and a geared diff would increase the rotating mass considerably of the transmission.
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