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Old Yesterday, 04:04 PM   #1
ga-stepside
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Join Date: Jan 2016
Location: Sugar Hill GA
Posts: 369
Re: '67 12 bolt gear ratio

If you don't want to pull the diff cover you can use these two calculators.

Get you tire size https://tiresize.com/calculator/
To find you gear ratio take the truck out and use your GPS to get an accurate MPH and a tach to get your RPM in top gear at like 70mph. Then put all that info onto
https://www.summitracing.com/popup/c...iAAEgIFzvD_BwE
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