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Which technique was required to change gear in a sliding mesh gearbox?

  • A.Rapid movement of the lever so that the gears meshed before the speeds had time to diverge any further apart
  • B.Full throttle
  • C.Application of the handbrake to slow the output shaft until it matched the speed of the gear being selected
  • D.Double declutching to match the shaft speeds

Answer: D

Double declutching releases the clutch, selects neutral, engages the clutch and blips the throttle to bring the layshaft to the right speed, then releases the clutch again to select the gear. It is still taught for heavy vehicles with unsynchronised boxes. The skill disappeared from ordinary motoring once synchromesh became universal. Naming what changes and what stays the same is the reliable route through questions of this shape.

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