Jim's Speedometer World

Ford 78% Increase Speedometer Gear Ratio Adapter

$227.00 USD

SALE SOLD OUT

Made in USA
New in box, includes plastic downsizer
Custom ratio available HERE

✅ 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 for this adapter to read accurately.

❌ 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 ratio adapter will speed up your speedometer gear rotation by 78%.

Increasing your speedometer gauge reading.

More increase percentages are available in our shop!

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 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

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