bone plunge is how much the end of the dogbone moves into the diff outdrive as the suspension moves.
as little as possible means free'er moving suspension when on power. and it will feel more similar on and off power - a lot of plunge stiffens the suspension on power
if you have a lot of plunge then the effect that Chris mensioned above is amplified.
you can normally change the amount of plunge by making your inner hinge pin as close to the outdrive as possible, and also the inner hinge pins as close to the 'ball' of the bone as possible.
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