Astro, "C", "K" & "S" Series & Safari

The Digital Ratio Adapter Controller (DRAC), or Digital Ratio Adapter (DRA) on "C" and "K" series, is a solid-state device that is used to change the signal from the vehicle speed sensor to a digital signal for speedometer operation.

The DRAC (DRA) is matched to the final drive ratio of each vehicle. If the final drive ratio is changed for any reason, the DRAC (DRA) must be changed on Astro, "S" series and Safari (recalibrated on "C" and "K" series) to maintain accurate speedometer/odometer reading. Incorrect DRAC (DRA) calibration will also affect Rear Wheel Anti-Lock (RWAL), Electronic Control Module (ECM), and cruise control module.