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it's true that harder bushings help a lot. it's because they take some of the energy absorption out of the system and thereby change the natural frequency of the system. the traction gain/loss cycle is part of the effects of the bounce caused by the cyclic loading and unloading at the natural frequency of the system (i said interference issue earlier, but my engineer friends would mock me for talking backwards if i ever said that to them in person). harder or softer tires will also change the natural frequency of the system. a more decoupled solution is asymmetric half axles.
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