Jim's Speedometer World

Custom Speedometer Gear Ratio Adapter

Name: Custom Speedometer Gear Ratio Adapter
Brand: Jim's Speedometer World
SKU: RA-Custom
Price: 177.99 USD
Availability: InStock

$177.99 USD

~~$197.99 USD~~ $177.99 USD

SALE SOLD OUT

Custom ratio required? (Percentage or Ratio numbers)

Compatibility: DODGE - GM - CHEVROLET and more!
New Assembly, includes 4 piece key end kit
Made in USA

✅ 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

(additional mods/adapters needed)

❌ These adapters will not fit behind the speedometer cluster

Die-cast aluminum and zinc oxide metal construction.
Direct replacement for the plastic OEM adapter.

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.

NOTE: If your original 7713 keyway was bound up and twisted in half, it was overtightened during installation.

Make sure that you install the 7713 drive tip nice and snug, but be careful not to over-tighten because that will cause it to get in a bind and snap.

REPLACEMENT #7713 KEY AVAILABLE HERE!

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

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