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Jim's Speedometer World

50% Slow down Speedometer Ratio Adapter

50% Slow down Speedometer Ratio Adapter

$167.99 USD
$167.99 USD
Sale Sold out
  • Made in USA
  • New in box, includes 4 piece keyway kit
  • Custom ratio available HERE



✅ Compatible with 7/8 by 18 thread speedometer cables
✅ All ratio adapters include the 4 piece key-way kit
✅ For use on the transmission/transfer case side
❌ Not compatible with any FORD application
❌ These adapters will not fit behind the speedometer cluster

This speedometer ratio adapter will slow down your speedometer reading.

Needed if your speedometer displays a higher number than your GPS reading.

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


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

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

Select the Slow Down Rate for your specific application.

If you need assistance calculating your percentage, send us a brief email with these speed readings to: jim@speedometer.world

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

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.

☆ 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!