Vehicle Speed Sensor Buffer

NOTE: Information for VSS buffer part number applicable to axle ratio and tire size combinations is not available from manufacturer. On some vehicles, VSS buffer is actually a part of the Digital Ratio Adapter Controller (DRAC), although the 2 terms may be used interchangeably.

If axle ratio or tire size is changed, it is necessary to replace VSS buffer to ensure proper operation or 4WAL brakes, cruise control, speedometer and engine Electronic Control Module (ECM) or Powertrain Control Module (PCM). Failure to replace VSS buffer as required may affect driveability of vehicle and 4WAL brake operation.