Her heart skipped a beat and then went into overdrive.
Moreover, he has to govern in accordance with the Rule, and must endeavour, while enforcing discipline and implanting virtues, not to sadden or "overdrive" his monks, or give them cause for "just murmuring."
A 5-speed synchromesh overdrive gearbox is standard with vacuum fitted brakes.
The overdrive gearbox is significantly different at the tail end than the standard box.
A cursory inspection of the underside will quickly reveal the truth - you have overdrive or you do not.