The disc in between these fixed to the casing are turned by the rear prop shaft whose speed is dictated by the rear road wheels. During normal road driving the rear wheel will follow at the same speed as the front wheel, so the discs in the viscous coupling are being tuned at a similar speed, and the fluid is undisturbed.
When the front wheel lose grip, the Freelander instantly becomes a full four wheel driver. Because the front wheels are spinning they rotate faster, as does the IRD, the front prop shaft and, there for rotors attached to the VCU’s input shaft.
The rear wheels rotate much more slowly, if at all, so the rear prop drives the VCU casing, and the rotors attached to it very slowly. With alternator rotors now spinning at different speeds, the fluid between becomes sheared or slide. That action causes the jelly to stiffen.
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