it worked on her 98 12v. Not sure what year they changed the speed sensor from the t-case to the axle.

 

I have been using my GPS for the correct speed . Mount it next to the rearview mirror, so I can always see it at a glance, and know exactly how fast I'm going. Its a Tom Tom, and displays the posted speed beside the actual mph. Works pretty good, Also been having trouble with my Speedo. Only works above 25mph. whats the problem with that? its a 99 2500 4wd .