Even with all the new equipment my speedometer is still jumpy, so I pulled the speedometer gear out of the car the other day and it was chewed to shreds. When I installed a T5 along with a new 3.55 rear gear in my 68 a couple years ago I made sure to use a new 4 speed speedometer cable and a new 23 tooth driven speedometer gear to correct my speed. You can convert to an electronic speedometer with a new Sending Unit.I bought my car 10 years ago and the speedometer has ALWAYS been jumpy.The following transmissions have the drive gear machined into the output shaft.In a 200R4, the drive gear is part of the governor assembly, in the oil pan.Get the combination of drive and driven gears that work for your vehicle.Using the formula above, recalculate using the tooth count for the available drive gears.Search for Speedometer Drive Gears that are available for your transmission.If a driven gear is not available, you may also need to change the drive gear. **You can also download the worksheet found at the bottom of this page.** Get the Driven Gear (for your transmission) with the closest tooth count to your calculations.Calculate the required tooth count for the driven gear.Follow this link to Calculate Tire Diameter.Find the gear ratio for the drive axle.Follow this link to learn how to Count the Teeth on a Speedo Gear.Count the teeth on the speedometer drive gear.per Mile = 20,168 / Tire Diameter (in inches) What gears should I get?ĭriven Gear Teeth = Drive Gear Teeth x Gear Ratio x Tire Rev. To fix the issue, different speedo gears are available. If you change tire size or rear-end gear ratio, your speed and odometer will be off.
This means the gauge is calibrated to 1 mile for every 1,000 revolutions. Most automotive speedometers have a 1:1 ratio. The cable is then connected to the speedometer.
They have 2 gears that work together to measure vehicle speed. Older vehicles use mechanical speedometers.
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