When the front wheels lose grip off road or on ice or snow, freelander instantly becomes a four wheel driver. Because the front wheel are spinning they rotate faster, as does the IRD, the front prop shft and therefore the rotors attached to the VCU’s input shaft.
The rear wheel though, rotate more slowly, if at all, so the rear prop drives the VCU casing and the rotors attached to it very slowly, with the alternator rotors now spinning at different speeds, the fluid between becomes sheared or slide. That causes the jelly to stiffen. The fluid, which is being dragged around by the input rotors, begins to pull the rear rotors with it, which rotors the rear prop shaft and puts drive, and freelander pushes itself out of the mud until the front wheel grip again, then everything reverts to normal.
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