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04-25-2013, 02:42 AM | #1 |
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Join Date: May 2010
Location: new zealand
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speedometer gear
can someone tell me what tooth gear in a 49/52 ford o/drive trans thanks
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04-25-2013, 04:54 AM | #2 |
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Location: East Hartford, Ct
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Re: speedometer gear
Depends on which rear end ratio, could be anything from 18 to 22.
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04-25-2013, 05:21 AM | #3 | |
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Re: speedometer gear
Quote:
Use your GPS to determine the accuracy of the speedometer as you drive. If the speedometer reads high, slow it down by adding a tooth to the number of teeth on the gear you have. Conversely, if the speedometer reads low, reduce the number of teeth. Generally speaking, one tooth variation will change the speedometer reading by 3 to 5 MPH. Once you get to within about 1 or 2 MPH accuracy, this is as good as it's likely to get. Trial and error is the only true way to progress due to the age of the equipment you are working with and the differences in tire circuferences. Be sure to lubricate your speedometer and cable to alleviate speedometer fluctuations. Good luck. |
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04-25-2013, 09:01 AM | #4 |
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Location: San Antonio, Texas
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Re: speedometer gear
FoMoCo had this to a science back in the day. They had differences for different axle ratios and different size rear tires since both have an effect. There is a chart in the ford Chassis Parts Catalog for the 49 thru 53 models.
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04-25-2013, 04:08 PM | #5 |
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Re: speedometer gear
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