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Old 08-19-2018, 09:10 AM   #7
ACK
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Join Date: Oct 2012
Location: Philly, PA
Posts: 537
Re: 1966 C10 speedometer gear question.

If your speedometer is running slower than actual speed, I believe it's the opposite, the driven gear needs less teeth to speed it up. Less teeth increases the RPM on the speedometer cable. The opposite would be true if the drive gear was being replaced.
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