Assertion: overdrive | /r/ObjectUse | used with the transmission box
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text: When we go on a long drive we shift our drive to the top gear which is said to be the direct drive, which means that the final output shaft is rotating at the engine’s rpm which in turn somehow increase the load on the engine’s shaft, so an overdrive can be used with the transmission box which can reduce engine’s load and provides high speed (higher than engine’s rpm) during a long run.