Only SHOs in Gen3 Taurus read their speed from the ABS. Other trims with a 3.0L (G, GL, LX, SE) all had a speed sensor. And thinking about it, it will be a good way to recognize a SHO trans from a SLO one by simple visual check up (as I'm sure that mine doesn't have this). Maybe some veterans here can have others trick to make the difference ? How I learned on Taurus VSS : I had to replace the one on my 98 SLO after a tramission shop didn't saw it when they lowered the trans from the car to rebuilt it. It stay plugged and was badly damaged after this but the guy (probably not so proud) didn't mention it after the repair and replug it as is. After a short time on the return from the trans shop, my speedo simply stopped to work, on highway (very funny). I can also said that if it stop to work, you will also lost the VAPS (variable assistance of power steering) which is a little freaking on highway... (as you don't have any resistance in the driving wheel at high speed). The SHO speedo problem wasn't for 97 IIRC ?