Discussion
Which mechanism was used in a traditional bolt on overdrive unit?
Answer: C
Laycock de Normanville units used a planetary set whose sun gear was braked to give the overdrive ratio, controlled by a cone clutch operated hydraulically from a pump driven by the gearbox. They were fitted to many British cars from the nineteen fifties onward. Modern gearboxes simply include an overdrive ratio among their gears. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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