Speedometer gear calculator

This is a retrofit gear to allow the speedometer to function with 3. Since the gear tooth pitch is slightly different than OE, the service life of this gear is limited to less than 20miles. Many speedometers have a given RPM they must turn at 60mph to be correct. Enter your tire size Tire diameter may vary slightly depending on the manufacturer. This calculator allows you to find a close gear set that will make it all happen. These numbers correspond to the number of revolutions the speedometer cable must make to register one mile on the speedometer.

The following speedometer drive gears and driven gears are available for the. To figure out which gear you nee visit LatemodelRestoration. Mustang speedometer gear calculator. The program will compute the best driven gear given a particular drive gear , or the best drive gear given the driven gear value. Use our speedometer calibration calculator to compare how fast you are traveling and your speedometer reading.

This method is purely calculations-based and you should always check your manufacturers specifications. The two gears are available in a variety of helix (spiral direction) and number of teeth configurations to produce reasonably accurate speedometer readings given the different tire, gear , and transmission combinations. The driven gear is attached to the end of the speedometer cable that is inserted into the side of your transmission. Vehicle that were factory equipped with the 3. Enter the values on the left and press Compute, the gear calculator will take care of.

This will help you pick the right speedometer gears combination for your classic. This information is deemed reliable - but NOT GUARANTEED. SPEEDOMETER GEAR CALCULATOR.

A shop must then change the speedometer gears to try to compensate and bring the speedometer back to calibration.

You can also determine the effects of tire wear by varying the tire height in 0. Tooth Driven Gear for Sidekick, Samurai. Calculator for the right gear ratio on the speedometer. Call today for the right gear for your application.

All gears are subject to availability and may not be in stock. It is also called the internal gear. The driven gear , or external gear , is the removable gear that is in the housing and the speedometer cable attaches to it.

Speedometer Gear Chart 200-4R. 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 neede you need to know two things, tire diameter and rear end gear ratio. Shift RPM Multiplier: Multiply your desired shift point RPM by the multiplier to find the engine RPM after the shift.

Please notify Webmaster of any inaccuracies on this chart. During the buil we needed to work out what speedometer gear I should use. In this video Paul covers how to determine how many teeth are. The tires caused my speedometer to offset by almost.

I wanted to get the right gears for my rear axle to accommodate the size change. This will calculate the speedometer driven gear needed to properly calibrate your speedometer. Always recheck the speedometer calibration!

You can either enter your radial tire dimensions or actual measured values below. This simple calculator does the math to help figure out the gears that are needed to make your speedometer work correctly. Whip out your calculator and follow along.

It turns the driven gear , a pinion gear that is connected to the end of the speedometer cable. Changing the ratio between the drive gear and the driven gear will change the speedometer reading. After you enter your vehicles tire size (using either a measured tire height or entering your tires P-Metric information) plus your vehicles rear end ratio, this calculator will display a chart indicating the speedometer gear set combination needed for an accurate speedometer reading in your vehicle.

With that comes an incorrect speedometer reading, which can be quite annoying. This gear is used in speed Toploaders in Galaxie, Fairlane and Sunbeam Tiger with speedometer hole on drivers side. This speedometer gear is most commonly used on cars with 3. This assumes no other changes such as tire or wheel size, engine changes or transmission changes.

According to the calculator with my setup it shows that I would need a speedo gear with 19. Also has a calculator for driven gear on the same page. Long before the days of digital dash clusters and dummy lights, cars used mechanical gauges. One just enters the tire size, rear end gear , and the number of drive gear teeth.

I found a calculator for a 700R and a way to estimate which gear you need based on how far the speedo is off. Does anyone have a simple speedo gear calculator or chart? Trying to figure out which gear for 3. I have a TH35 tires and 3. Plug in your current drive gear and see if the calculator gives you a driven gear within the available range. The NPD catalog has a calculator printed on the same page where they list speedo gears.

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