Originally Posted by 04blackedge
Speed Sensor Input (Explorer Gray/Black at console): 2003 and older Ranger's use the Gray/Black wire at the GEM. 2004 and newer Ranger's use the Gray/Black wire at the Smart Junction Box (brown connector).
One important correction is for the gray/black VSS wire at the SJB which was only there in 2004 MY. For 2005~2006, it can be accessed in the large wire bundle near the parking brake pedal.
The "2004 and newer" info was originally written in 2004 as an addendum to John Griggs's 2001~2003 How-to on CarDomain. It applies to 2004~2006 only except for the 05~06 VSS change noted above. Unfortunately, I have not been able to get in contact with John to ask him to update this info for the model years after 2004.