odometer not working on F350

Not necessarily. I had an old Firebird with the opposite problem. Odometer works, but speedo didn't. I replaced the speedo cable and all was good again. You might try pulling the cable from the sleeve and greasing it up good too.

The OTHER Kevin in San Diego <skiddz "AT" adelphia "DOT" net> wrote in news: snipped-for-privacy@4ax.com:

please explain how you think this happened?? they both run off the cable on the older ones and should not be poss. to affect one or the other seperatly. KB

Also, the speedo on the 99 superduty is electronic, not mechanical, speed is sensed from the rear diff ring gear sensor. Probably a component in the speedo is fried. I think someone tried to roll back the miles.

I would if I could, but I don't have a clue as to why the odometer worked but the speedo didn't. Doesn't make sense, but I know what I saw.

If the speedo has been replaced (a rather important bit of info) and the odometer had been replaced along with it, there should be documentation showing the odometer reading before replacement, so you can account for the new odometer reading. But that's not your problem, so I'd guess maybe something became disconnected or not connected correctly. I'm not an EE so I wouldn't know what components to trace. You have to take the dash cover off (I think you have to remove the radio first, you;ll need a special Ford radio removing tool for that) then the speedo housing should come out as a unit.