What is the ratio of a differential with 39 teeth on the ring gear and 11 teeth on the drive pinion gear?

To determine the gear ratio of a differential, you can use the formula that divides the number of teeth on the ring gear by the number of teeth on the drive pinion gear.

In this case, the ring gear has 39 teeth and the drive pinion gear has 11 teeth. The calculation would be:

39 teeth (ring gear) ÷ 11 teeth (pinion gear) = 3.5454545...

When rounded to two decimal places, this is approximately 3.55. This indicates that for every single rotation of the drive pinion gear, the ring gear makes about 3.55 rotations.

In practical applications, this would be rounded and expressed in a common format, which often involves expressing it as a ratio. The closest standard ratio in the options provided, therefore, would be 3.54 to 1, which is correctly identified as the right answer. This ratio helps mechanics and vehicle owners understand the torque multiplication and acceleration characteristics associated with the vehicle's drivetrain.

The significance of this number lies in its application in performance tuning, fuel efficiency considerations, and compatibility with different types of driving conditions.