How do you determin the gear ratio of a differential

Tiny
JOSLEE
  • 2002 SUBARU IMPREZA
  • 150,000 MILES

I want to change the differential, but it must have the same gear ratio as the other one.

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Wednesday, April 18th, 2012 AT 4:37 PM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,398 POSTS

There should be a tag on the differential itself.

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Wednesday, April 18th, 2012 AT 4:53 PM
Tiny
CHOPPER
  • MEMBER

Count ring gear teeth and pinion gear teeth divide = gear ratio. Or just call dealer with vin number and they can tell you what came stock.

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Tuesday, May 1st, 2012 AT 4:41 AM

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