ASE G1 Auto Maintenance and Light RepairManual Drive Train and AxlesEasy
Which of the following components is responsible for allowing the drive wheels of a vehicle to rotate at different speeds when turning?
- APropeller shaft
- BDifferential
- CTransfer case
- DTransmission
Show answer & explanationAnswer & explanation
Correct answer: B. Differential
The differential is a crucial component in the drivetrain that allows the left and right drive wheels to rotate at different speeds during turns. Without it, the wheels would skid and scrub, especially on paved surfaces.
Why the other options are wrong
- A. A propeller shaft (driveshaft) transmits power from the transmission/transfer case to the differential.
- C. A transfer case distributes power between front and rear axles in 4WD/AWD vehicles.
- D. The transmission changes gear ratios for speed and torque.
Differential Function
The differential is a gear assembly that allows the drive wheels on the same axle to rotate at different speeds, which is essential for smooth turning.
- Located between the drive wheels (front or rear).
- Contains spider gears and side gears.
- Prevents wheel scrubbing and tire wear during turns.
Memory trick: Differentials let wheels turn at different rates, avoiding tire fates.