Description
#54RA, GM / Dodge Speedometer Ratio Adapter, Select the Slow Down Rate for your specific application.
This speedometer ratio adapter will reduce your speedometer reading.
Made for low rear end ratios with short tires.
Can be made to offset for clearance reasons. This part will slow down your speedometer reading.
It is only made to go to the transmission or transfer case and not behind the speedometer cluster.
Includes 4 piece Small Parts Kit.
Use -37.5% to convert Kilometers to MPH.
Slow Down Percentage indicator number:
| 2.56% Slow down | AA 0.9743 |
| 10% Slow down | AA 0.9000 |
| 13.7% Slow down | AA 0.8626 |
| 17.6% Slow down | AA 0.8241 |
| 20% Slow down | AA 0.8000 |
| 26.7% Slow down | AA 0.7333 |
| 28.5% Slow down | AA 0.7143 |
| 37.5% Slow down | AA 0.6250 |
| 50% Slow down | AA 0.5000 |
If you need assistance with figuring out which percentage you need, feel free to call us with these speed readings:
| When your GPS shows: | What your Speedometer displays: |
| 40 mph | ?? |
| 50 mph | ?? |
| 60 mph | ?? |
Please be sure to give us these readings in this EXACT order (40,50,60 GPS vs speedometer) to prevent receiving the incorrect percentage.
For information, call 888.201.2066 or send an email to jim@transmissioncenter.net
For Speed Up Ratio Adapters, click HERE!
Click HERE for the Main Speedometer Gear page!
