Speedometer not moving
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Tuned
Joined: May 2003
Posts: 317
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From: New Jersey
Speedometer not moving
1990 F150, 5.0, 4PSPD Auto OD 2WD Trans, Speedometer, Odometer and Cruise not working at all. Checked the fuses, pulled the cable and needle moves when cable is turned. Could the problem be a sensor on the rear diff or is there a gear inside the trans housing that needs fixing?
Thanks for any help.
Chet
Thanks for any help.
Chet
Postmaster
Joined: Mar 2001
Posts: 4,968
Likes: 3
From: So Cal
You mentioning a cable leads me to believe your year and model uses a direct drive at least for speedo. There would be a matching gear inside the tranny or a drive socket for the cable to plug into.
The newer models use a sensor on the differential. If you spot something about the size of a walnut on the top part of the diff with wires on it, then you have a sensor and at least part of the speed functions are run thru the computer.
If the gear inside the tranny is shot then your speedo won't turn and this can affect cruise and odo.
I am not sure if your year model has a separate electronic sensor feeding the computer to control the cruise and odo. If your odometer is the spinning dial type, then that means it is also mechanical and runs off the cable.
Good Luck,
Jim Henderson
The newer models use a sensor on the differential. If you spot something about the size of a walnut on the top part of the diff with wires on it, then you have a sensor and at least part of the speed functions are run thru the computer.
If the gear inside the tranny is shot then your speedo won't turn and this can affect cruise and odo.
I am not sure if your year model has a separate electronic sensor feeding the computer to control the cruise and odo. If your odometer is the spinning dial type, then that means it is also mechanical and runs off the cable.
Good Luck,
Jim Henderson
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
The sensor on the rear differential has nothing to do with any of your problems. It only runs the ABS computer.
The cruise is a seperate problem, but I'm assuming you're least worried about that. If the speedo moves when you turn the cable, then the gear in the tranny tailshaft is broken and needs to be replaced. I haven't had to do that repair, so I can't help too much on how difficult it is. That will fix your speedo and your odometer.
The cruise is most likely a blown fuse, but it could be other wiring problems as well.
The cruise is a seperate problem, but I'm assuming you're least worried about that. If the speedo moves when you turn the cable, then the gear in the tranny tailshaft is broken and needs to be replaced. I haven't had to do that repair, so I can't help too much on how difficult it is. That will fix your speedo and your odometer.
The cruise is most likely a blown fuse, but it could be other wiring problems as well.
