• CBI speedometer gear ratio adapter with one Ford ferrule end, a plastic downsizer, and a label that reads "custom ratio".
  • Speedometer ratio adapter with a Ford ferrule end for Ford mechanical transmissions and Ford mechanical transfer cases. 'Your choice of percentage' text overlay.
  • A CBI mechanical ratio adapter with a 7/8 by 18 thread on one end and a Ford ferrule on the other end so it can be used with Ford applications.
  • An image of a CBI ratio adapter with a Ford ferrule end. Including an instruction for the 7/8 x 18 thread end. Including an instruction for the Ford ferrule end. And including an instruction to re-use your o-ring.
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Jim's Speedometer World

Custom Ford Speedometer Gear Ratio Adapter

Custom Ford Speedometer Gear Ratio Adapter

$247.00 USD
$247.00 USD
SALE SOLD OUT
  • Made in USA
  • New in box, includes plastic downsizer



✅ Compatible with 7/8 by 18 thread speedometer cables.

✅ Includes Ford ferrule 


NOTE: You must change your Ford type cable to a GM type cable, which will have a 7/8 by 18 thread on the transmission side and match the speedometer side with your existing setup. ( Some will have push-in ends, clip-on ends, or 5/8 by 18 thread ends. Match the cable end you need )


✅ All Ford ratio adapters include the white plastic downsizer.

✅ For use on the transmission/transfer case side.

NOTE: Must reuse previous Ford driven gear, and previous Ford gear C-clip used during speed reading session.

❌ These adapters will not fit behind the speedometer cluster.

This Ford ratio adapter will work with Ford mechanical cable driven transmissions and Ford mechanical cable driven transfer cases.

❌ Will not work with speed sensors or electronic applications.

This adapter will be built with your specific specs.
Make sure to fill out your needed ratio, or percentage, in the text box.
Your order may be delayed if you do not disclose the proper information.

If you need assistance calculating your percentage, send us a brief email with these clean speed readings to: jim@speedometer.world
(Straight cable, without any previous adapters in place)

The GPS displays:
 But your Speedometer displays:
40 mph
 ??
50 mph
 ??
60 mph
 ??

We recommend acquiring these numbers with two people in the vehicle.
One person in the passenger seat with a GPS device/cellphone displaying current speed, who will alert the driver at 40mph, 50mph and 60mph.
The driver can then more accurately relay what their speedometer displays at those 3 intervals.

Be sure to give us these readings in this exact order, 40mph - 50mph - 60mph on the GPS versus what your Speedometer displays, to ensure the proper percentage.



Non-custom common decrease, reducer / slow down ratios we have available:

10% Slow down

AA09000

Ratio 0.9000

17.6% Slow down

AA08241

Ratio: 0.8241

20% Slow down

AA08000

Ratio: 0.8000

26.7% Slow down

AA07333

Ratio: 0.7333

28.5% Slow down

AA07143

Ratio: 0.7143

37.5% Slow down

AA06250

Ratio: 0.6250

50% Slow down

AA05000

Ratio: 0.5000


Non-custom common increase, speed up adapter ratios we have available:

11% Speed up

AA11111

Ratio 1.1111

20% Speed up

AA12020

Ratio: 1.2020

28% Speed up

AA12844

Ratio: 1.2844

38% Speed up

AA13846

Ratio: 1.3846

44% Speed up

AA14400

Ratio: 1.4400

50% Speed up

AA15000

Ratio: 1.5000

61% Speed up

AA16154

Ratio: 1.6154

78% Speed up

AA17778

Ratio: 1.7778

100% Speed up

AA20000

Ratio: 2.0000

 

Use the -37.5% adapter to convert Kilometers to MPH.

Use the +61% adapter to convert MPH to Kilometers.

If you recently changed wheels and/or tires, and your speedometer is now reading incorrectly, a ratio adapter may be required.



☆ Made in USA ☆

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WE CAN HELP!

📧 Having trouble with your speedometer not agreeing with the GPS?

Send us a brief message with your current application specs and we can help you mastermind a solution!

EMAIL US!