GM / Dodge Ratio Adapter, Select Slow Down Percent
54RA. This GM / Dodge / ratio adapter will slow your speedometer reading down. 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 head.
Use -37.5% to convert Kilometers to MPH.