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Rear diff ratio

Uberoo
in Historic Subaru Forum: 50's thru 70's

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I'v been hearing conflicting data about the rear diff ratio on a Gen 1 brat.So short and sweet what is the rear diff ratio under a gen 1 brat with the EA71 and top mount starter FWD-4wd transmission?

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I was hearing that it was either 3.7 or 3.9,Mine doesn't have a tag which is why I was asking.

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