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Your speedometer and odometer are independent of one another as far as calibration goes but if you have just had your transmission repaired or lifted your truck and put 36" wheels on it, chances are it will not be calibrated any more.
The only way to have a speedometer calibrated is to take it to a certified speedometer repair shop and let them do it.
A couple of alternatives:
1. Have a friend in another car signal you when he reaches a predetermined speed.
2. You can get a rough idea of how far off it is by bringing along a friend with a watch with a second hand, a pen and paper to record your odometer while you drive. Go to an interstate and use the mile markers. Since you aren't sure if your speedo is correct, follow someone or stay in the right lane and drive fast enough so you aren't creeping along and tell your ride to record the mileage - as you pass it, call it out. Drive at least ten miles and call out the end mileage. Divide 10 by the difference between the end and start odometer readings.
If you start at 12,345.6 miles and end at 12,353.2 your speedometer is only 76% accurate. If you still have a gear in the transmission, you have to pull it out and count the teeth. GM 350 auto trans can handle gears from 18t to 24t, 700R4 trans gear range is from 34t to 45t. Fords go from 16t to 23t available from motorsport. Both GM and Ford make gears used in manual trans' that are cut opposite to auto trans gears. Chrysler also has a wide range of gears but it's been a while since all gears were available from the dealer.
Divide 100 by this number, that represents roughly what each tooth is worth percentage-wise. To make your speedo faster, subtract teeth. More teeth makes your speed go down. This holds true for all makes of vehicles.
3. If you have an electric speedometer (chances are you do) there are too many ways to list but chances are your PCM will need a software change to correct the speedo.
If you drove ten miles and the odometer says ten, then you should be able to drive at 30 MPH non-stop for two minutes and your odometer should have recorded one mile.
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∙ 13y ago
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How do you fix speedometer on 1990 delta 88?
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Is it possible to calibrate the speedometer on a 1996 Ford Taurus GL Mine is 6mph higher than it should be?
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You have a 1991 Ford Explorer and the speedometer seems to read faster than vehicle is traveling How do you calibrate a speedometer?
First, make sure the vehicle has the right size tires. Look on the door plate or in the glove box to find the size recommendations. If the tires are sized correctly, the speedometer cable gear can be changed to affect the speedometer displayed speed. Remove the cable where it enters the transmission tailshaft, count the number of teeth and get a different size gear depending on whether you want the speedometer to display faster or slower. If the speedometer is showing slower than you are actually travelling, get fewer teeth on a replacment gear. If the speedometer is showing faster than you are actually travelling get a gear with MORE teeth on the replacment gear.
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How do you recalibrate 1991 S10 speedometer?
This truck has an electronic speedometer. There is no speedometer drive cable, and therefore no drive gear to change to adjust the ratio. You can buy a box for around $170 that is inserted into the sensor circuit to adjust the speedometer readout. You can figure out how to reprogram the speedometer. Those are the options I have found. I am dealing with this issue on my girlfriend's son's S-10. Further research found this reference, which looks good to me. This weekend, I'm going to find the DRAC module and modify it according to the directions. The electronic module is very specific. Is it worth spending the money just to "calibrate" the speedometer. What are the symptoms of the uncalibrated speedometer. Wheel size change. Tire size change. It would be cheaper and faster to just have a dealer do it then you wouldn't have an expensive piece of useless equipment taking up space
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