Technician A says that when an automatic transmission/transaxle shifts into overdrive, the output shaft is rotating faster (higher RPM) than the engine crankshaft. Technician B says that an overdrive ratio is a ratio where the first number is less than 1. Which technician is correct?

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is correct because in overdrive, the transmission allows the output shaft to rotate faster than the engine crankshaft, improving fuel efficiency at high speeds. Technician B is correct because an overdrive ratio is indeed a gear ratio where the output speed is higher than the input speed, typically represented by a ratio less than 1.

Technician a Says That When an Automatic Transmission/transaxle Shifts into Overdrive