Speedometer-Driven Gear Type 3A 18-Tooth Mustang With 4-Speed Toploader Transmission 1965-1973

CJ's Part Number:
100% of 100


  • Premium Quality Material
  • Left Hand Rotation
  • 18 Tooth Gear
  • Type 3A Gear

Type 3A 18-Tooth Speedometer-Driven Gear for 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972 and 1973 Mustangs with a 4-Speed Toploader Transmission.

Are you looking for a new speedometer driven gear for your 1965-1973 Mustang? Does your Mustang have a 4-speed toploader transmission? If so, you should definitely take a closer look at this Type 3A 18-Tooth Speedometer-Driven Gear from CJ Pony Parts!

Features and Benefits:
- Fits 4-speed toploader transmissions
- Made for gear access hole on passenger side of transmission
- Sold individually
- Type 3A with 18-tooth design

This Type 3A 18-Tooth Speedometer Driven Gear is usually used on transmissions that have the speedometer gear access hole on the passenger side of the transmission. The speedometer gears will attach to the end of the speedometer cable and insert into the end of the transmission. It's meant to be used on Mustangs that have a 4-speed toploader transmission. It is sold individually, which means you'll get one when you place your order.

*Type 3A gears are for left-hand rotation.

Vehicle Fitment:
- 1965-1973 Mustang with 4-Speed Toploader Transmission

California Residents: Proposition 65 Warning

Video Transcript

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.

Vehicle Fitment

This product will fit the following Mustang years:

Only registered users can ask/answer questions. Please sign in or create an account.
Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account
Complete Your Package
Add to Cart