- How do you determin the gear ratio of a differential

2002 SUBARU IMPREZA
150,000 MILES
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JOSLEE
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  • 1 POST
I want to change the differential, but it must have the same gear ratio as the other one.
Apr 18, 2012 at 4:37 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
There should be a tag on the differential itself.
Apr 18, 2012 at 4:53 PM
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CHOPPER
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  • 16 POSTS
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.
May 1, 2012 at 4:41 AM
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