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Old 15-03-2010, 05:10 PM
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Default What's required to convert a WRX from 3.9 to 4.444 final drive ratios?

Thanks to a tricky local hill climb I am looking for a parts shopping list to convert my stock standard MY99 WRX to a final drive of 4.444

Currently it has the MY99 gearbox housing and 1-5 helical Ivan Albins gearset, (these came standard in the Glorious Nation of Kazakhstan) other bits are:
  • Original 3.9 front diff
  • Original MY99 center diff of 1.1:1
  • Rear diff is a Kaaz 1.5 plated LSD with 3.54 crown and pinion also released in...Kazakhstan

Now a front and rear diff crown and pinion set of 4.444 seems inevitable but what's with the center diff? I guess I need one of these also? Then what about gear adapters to keep the speedo readings correct?
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