They changed the gear cluster on the winning (!) R10 during the 2006 Le Mans 24 hours.
Quote:
The winning car made only 27 pit stops during the 24:04:47.325 hours. The car only made two unscheduled pit stops: once to change the gear-cluster in the gearbox (03:47 a.m.), and once due to a slow puncture (04:23 a.m.).
Thanks to Audi Sport’s revolutionary new gearbox concept the gear-cluster change required a mere 9:50 minutes – including refuelling and change of tyres.
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Their quick change solution helped secure the victory that year.
Of course that was before the arrival of Peugeot. Now only the car with the "perfect" race stands a chance at victory.