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Which two functions does the final drive perform?

  • A.A speed reduction and, in some layouts, a change of direction
  • B.A change of direction only, since the whole of the reduction is provided within the gearbox ahead of it
  • C.A speed increase
  • D.A division of the torque between the two driven wheels, which is the sole purpose of the final drive assembly

Answer: A

The final drive provides the last reduction between the gearbox output and the road wheels, and in a longitudinal layout it also turns the drive through ninety degrees. The differential housed within it divides the torque. Both reduction and direction change are performed by the same pair of gears. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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