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Old 08-13-2022, 10:34 PM   #38
ford38v8
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Join Date: Jul 2011
Location: SF Bay Area
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Default Re: Lazy speedometer

Quote:
Originally Posted by Ricosan View Post
Here is what I have.

The number on yours appears to have been obliterated, at least the picture doesn't show it. The only reason to obliterate that number would be if the turtle had been modified to accept a different gear than original to the turtle. Guys have done that because the turtle they need was not available. Remove the turtle and count the gear teeth, simple and quick. Then count the revolutions of the driveshaft to one revolution of an elevated wheel, which will indicate the differential ratio. (One elevated wheel will turn twice the ratio.) With that ratio and tire size, you can determine the correct turtle gear.
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