How do I know which speedometer gear to use?

How do I know which speedometer gear to use?

To determine your tires true diameter in relation to determining what speedometer gears you need, measure from the ground up to the center of the axle then multiply by two. The actual run out of the tire can be as much as 2 to 3 inches less than what the circumference of the tire measures.

How do you measure a Muncie 4 speed speedo drive?

Muncie 4-Speed Transmissions: Speedometer Gear Calculations

1. Formula for Calculating Tire Diameter.
2. Tire Diameter = (2 x sidewall height) + wheel diameter.
3. Section Width = 255 mm ÷ 25.4 = 10 inches.
4. Sidewall Height = 10 x .60 = 6 inches.
5. (6 x 2) + 15 = 27 inches.
6. Formula for Calculating Speedometer Driven Teeth.

How do I slow down my speedometer?

“If you need to slow down the speedometer, you need more teeth on the driven gear.” For example, if your speedometer is showing 60 mph and it should be showing 52 mph, you will need to use a driven gear with more teeth to spin the speedometer cable slower. In this case, you need to add three teeth.

How do you calculate driven gear?

The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs).

How do I recalibrate my speedometer?

Press and hold the calibration button located on the speedometer, start the vehicle, and then release the button. Press that button again and then take the test drive. Once you have driven the distance needed, press the button once more and the speedometer will calibrate itself to accommodate the new tire size.

How do you count teeth on Speedo drive gear?

Look at the gear from the side.

1. Mark the tooth where you start.
2. Count the peaks all the way around the gear. In the picture below, each red dot is 1 tooth.

Can my speedometer be wrong?

Speedometers can show the wrong speed There are several factors that can cause a speedometer to show a speed that is incorrect. One major factor is the age of the car, as many times older vehicles with a lot of miles and wear on them will have speedometers that are not as exact as they used to be.

Can you adjust a speedometer?

If you have an electric speedometer, you would start by determining the distance of the test drive you would need to recalibrate your speedometer, which can be found in the vehicles supporting documents. Press and hold the calibration button located on the speedometer, start the vehicle, and then release the button.

Which gear has highest speed reduction?

Worm gears are perhaps the most costeffective reduction solution, but usually have a minimum 5:1 ratio and lose considerable efficiency as ratios go higher. Bevel reducers are very efficient but have an effective speed reduction upper limit of 6:1.

Will putting bigger wheels change my Speedo?

You might ask: do bigger tires make your speedometer faster? The answer is no. Tire size and speedometer accuracy are directly linked to each other. Up-sizing, or installing a taller tire, will lead to a speedometer reading that is slower than your actual speed.

How much does it cost to recalibrate speedometer?

Getting a Speedometer Calibrated Most auto-mechanics perform speedometer calibrations, and some driving schools perform them as well. The cost is usually approximately $75.

What are the gears for a TCI speedometer?

Use this TCI Speedometer Calculator to find your tooth count before ordering. Click the link! 17-22T .810 diameter gears must be used with a 1.84 OD speedo drive gear. 22-24T .870 diameter gears must be used with a 1.76 OD speedo drive gear.

How many teeth does a 200-4R speedometer have?

Comes in 26 to 31 tooth gear count. quantity 200-4R Speedometer Driven Gear. Comes in 26 to 31 tooth gear count. Most cars with low rear end ratios will take a 10 tooth drive gear. The drive gear is part of the governor assembly which is located inside the oil pan.

What kind of gears are used in Muncie GM T10?

Prod. Code: New OEM AC Delco gears are used in Muncie, GM T10, GM Super T10, Saginaw 3 & 4 speed, GM T5, Powerglide, 200 & 350 transmissions. NEW! Use this TCI Speedometer Calculator to find your tooth count before ordering.

Do you need to change gears on a speedometer?

After changing rear end gears or tire diameter you will likely need to swap one or both speedometer gears to keep the speedometer reading correct. To determine which speedometer gears are needed, you need to know two things, tire diameter and rear end gear ratio.