Speedometer Driven Gear Kit Type 3 17/18/20/21-Tooth Automatic/Manual Transmission

CJ's Part Number: SGK1
MSRP: $55.95
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Speedometer Driven Gear Kit Type 3 17/18/20/21-Tooth Automatic/Manual Transmission
Speedometer Driven Gear Kit Type 3 17/18/20/21-Tooth Automatic/Manual Transmission Play Speedometer Driven Gear Kit Type 3 17/18/20/21-Tooth Automatic/Manual Transmission Video 1

Product Description

Type 3 17/18/20/21-Tooth Speedometer Driven Gear Kit for Mustangs with an Automatic or Manual Transmission.

Have you noticed that the speedometer reading on the instrument cluster isn’t accurate due to a rear gear swap or the addition of bigger wheels and tires? So if you want your Mustangs Speedometer to read properly purchase this Type 3 Speedometer Driven Gear Kit today at CJ Pony Parts. This kit will save you time as well as money since this is a complete kit that will correct your speedometer reading.

Kit Includes:
- 17 Tooth Driven Gear
- 18 Tooth Driven Gear
- 20 Tooth Driven Gear
- 21 Tooth Driven Gear
- Speedometer Cable Gear Retainer Clip

Please Note: This Type 3 Speedometer Driven Gear Kit is for right hand rotation.

Transmission Applications:
- C4 Automatic Transmission
- C6 Automatic Transmission
- FMX Automatic Transmission
- Ford 3-Speed Manual Transmission
- Ford 4-Speed Manual Transmission
- T-5 Manual Transmission
- Tremec Manual Transmission
- T-45 Manual Transmission

These Type 3 speedometer driven gears are typically used on transmissions where the speedometer gear access hole is on the driver side of the transmission. Speedometer gears attach to the end of the speedometer cable and are inserted into the end of the transmission. With the correct speedometer cable gear retainer clip included with this kit, this kit has everything necessary for a proper installation.

Purchase a new Type 3 17/18/20/21-Tooth Speedometer Driven Gear Kit for your Mustang with an Automatic or Manual Transmission from CJ Pony Parts today!

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Product Questions

I bought the SC-18 cable and installed the same Speedometer Driven Gear that I had before. I change the Speedometer and now I got a 10 mile difference. When the speedometer indicates 80 I'm really 70. what should be the correct Driven Gear to correct this

Asked by: Isra
You need to figure out exactly what speedometer gear you currently have and purchase one with 2 more teeth to correct this inaccuracy.
Answered by: CJPP Dave
Date published: 2015-10-09
  • 2016-05-04T07:56CST
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Product Video

Speedometer Driven Gear Kit Type 3 17/18/20/21-Tooth Automatic/Manual Transmission Video Transcript
By Bill Tumas: Today we're going to show you how to correct the speedometer in your 1964 through 2014 Mustang. If you own a 1964 through 1998 Mustang, your speedometer is going to be calibrated mechanically using a drive gear and a driven gear. The driven gear mounts on the end of the speedometer cable, and is going to go in the side of your transmission. The drive gear mounts on the tail shaft, spins the driven gear, which turns the cable and spins your speedometer.
These are the two styles of driven gears that are available. The gray gear is a type three gear, which is a right-hand rotation designed for transmissions where the cable enters on the left side of the transmission.

This here is a type three A with a left hand rotation. This will be used with transmissions where the cable enters on the right hand or passenger side of the transmission. The drop gear shown here is available in six, seven or eight tooth varieties. When paired with one of the speedometer gears it can pretty much come with any gear ratio necessary to get your speedometer pretty close. The driven gears are available from 16 tooth all the way up to 23. There is a mathematical formula you use to determine which driven gear you need based on what drive gear you are using.

What you'll want to do is take the drive gear teeth times that by the axle ratio of your car. If there are 373 gears you'd times it by 3.73 and you would times that by the tire revolution per mile, which you would be able to get off the manufacturers site for the tires you currently own. You times those three numbers together, divide by 1001 to determine which driven gear you need.

This is a speedometer gear retainer. This actually holds the driven gear to the speedometer cable itself. When ordering a new gear, it's never a bad idea to order a new retainer, as well. If you own a 1999 through 2014 Mustang you'll have to recalibrate your speedometer electronically. For 1999 through 2008 manual transmission cars you can use a speedometer calibration box here. Inside the box is a series of dip switches that you adjust to correct for speedometers. Again, this will only work on your 1999 through 2008 manual transmission. It will not work on an automatic.

For all 1999 through 2014 Mustangs the other option is going to be the X-Cal custom tuner. This will not only give you performance benefits, it allows you to calibrate your speedometer as well as your revolutions per mile to get the electronic speedometer perfectly adjusted.

Remember both gear changes, as well as tire changes, have an effect on your speedometer so you'll want to adjust accordingly. Using the drive gear and driven gear you'll be able to adjust from anywhere from a 273 gear all the way up to a 456. With electronic speedometers, it's pretty much infinite as far as the amount of adjustment.