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Old 04-28-2007, 11:16 AM
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TH350 speedo gear calculation

if you math wizards can check my math for correct speedo gearing
27.1 inch diameter tire
tire revs per mile 768.0
3:73 rear ratio
speedometer calibrated at 1000 revs per mile.
I come up with a 7 tooth drive gear (on tranny shaft)
20 tooth driven gear (on speedo cable)
that will give a .50% margin of error.
Id rather the speedo read a bit high than low.

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Old 04-30-2007, 11:34 PM
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8 driving 22 will get you closer.
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