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What's the difference between 3.15, 3.31, 3.55, 3.73 TORSEN limited-slip rear axles?

Been trying to build a nifty 2016 Mustang GT Premium Fastback on Ford's website, and can't quite understand the difference in the available options for the limited-slip rear axles. Can someone explain the difference between the sizes I listed or what it means if the size is higher vs lower.

Thanks in advance.

1 Answers1

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Gear ratio is the only difference.

3:73 to 1 is the lowest ratio which means it will be faster in the short run, stop light to stop light.

3:15 to 1 is the highest gear ratio which means it will be faster on the top end, highway.

The first number means how many revolutions the drive shaft turns for one revolution of the rear wheel.

The higher the first number is the Lower the gear ratio is, which means it will have faster acceleration on the low end (stop light to stop light).

Depending on how much Horsepower you have what these numbers actually mean in performance.

Hobbes
  • 4,422
  • 18
  • 23
Moab
  • 8,035
  • 21
  • 32