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05-09-2006, 10:25 PM
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Speedo gear in tranny change???
My tranny is being rebuilt as I speak. I need to get my speedo recalibrated but forgot to check the mph with my GPS. Is there a way to figure out what gear I need in the tranny if I now what size tires where stock on my car vs. what I have now?
Car is a 66 Impala with 235/50/18 tires. 3.73 rear gears......  Dave Last edited by black66; 05-09-2006 at 10:43 PM. 
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05-10-2006, 01:18 AM
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05-10-2006, 09:41 PM
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Or, plug your tire diameter and rear end ratio into the formula at http://novaresource.org/speedo.htm , and you'll get your speedo gear ratio that you need. Take that figure to the chart, and find which gear combo fits your need best.
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