The Vehicle Speed Sensor is what feeds information to the computer for the speedometer, It is located in the tail-shaft housing of the transmission. The diagram below is of a 4wd, but the location will be similar. The Wheel speed sensors are a different sensor used for traction control and ABS. I believe the 06 trailblazer EXTLS four-wheel-drive has two on the transfer case at the rear end of the transfer case. Check out the diagrams (Below). Please let us know what you find.
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Friday, May 7th, 2010 AT 8:09 PM