'84 P/U differential

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Sep 16, 2006 | 10:03 AM

mla2ofus

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Joined: Sep 2006

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'84 P/U differential

Mine is a 5 sp w/ 3.3 rear end. Has anyone ever changed ring & pinion to 3.9 from a P/U w/ auto trans? Just wondering if this is detremental to gas mileage?
Mike

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