Speedometer reversed?

[white lando]

My speedometer on my 2002 f-250 has been acting really strange. When i start out the speedometer is pegged at 100mph and as i drive it slowly goes down and will eventually stop at 70mph and fall back to 100mph when i come to a stop. At first it would correct it self after about 20-25min of driving and now it is just a persistant problem. There are no other indicator lights like the abs or overdrive light on.

After searching the forum the only thing i found was to switch out the vss in the rear differential which i did today to no change in the problem.

Help me powerstroke.org you're my only hope (Star Wars referance in case you missed it)

[JSchuricht]

I would say that your cluster is bad. You can pull it and feed it a sign wave, I forgot the frequency range, to test the motion.