How does the vssb work on a GM car?
How does the vssb work on a GM car? In the same fashion if gear ratios or tire sizes are changed, the module may be quickly swapped or reprogrammed for the correct ratios. The unit takes input from the transmission VSS (Vehicle Speed Sensor) to derive pulses per mile, according to the rotation of the transmission tailshaft. What was the vssb / DRAC used for in 1989? If you find something incorrect or wish to contribute something, just let us know here . The external VSSB/DRAC (Vehicle Speed Sensor Buffer / Digital Ratio Adapter Controller) module was used in 1989-1995...