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I have a 99 F450 with the 7.3l. The speedometer/odometer stopped working and the overdrive us flashing. I changed both VSS sensors and it still doesn't work. I just had it checked and there are no codes being thrown. Any help would be appreciated.
 

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If the overdrive is flashing, you have transmission codes. You need a scanner capable of reading them. When I had this happen, it turned out the wiring harness coming from the VSS was self destructing. I bought a new pigtail for the VSS, but when I went to splice it in, the wiring was chalky black powder. I cut up a few inches - still oxidized wire. I ended up cutting a couple of feet forward of the VSS before I found good copper. Spliced in a new wire and problem solved. Yours could be the same, or it could be something completely different. The code will help narrow it down.
 
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