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Which component allows a full time four wheel drive system to corner on tarmac?

  • A.A locking hub
  • B.A viscous coupling that locks the two axles rigidly together whenever a difference in speed is detected between them
  • C.A centre differential
  • D.A transfer case with a low ratio, which reduces the speed of the front axle relative to the rear during turns

Answer: C

The front and rear axles travel different distances through a corner, so a differential or a compliant coupling between them is essential if wind up is to be avoided. A part time system without one must be disengaged on high grip surfaces. A viscous coupling transmits torque progressively rather than locking rigidly, which is why it can serve the purpose. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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