2000 F250 Speedometer jumping around - Ford Powerstroke Diesel Forum
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Old 05-10-2013, 07:25 AM
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2000 F250 Speedometer jumping around

I have a 2000 F250 with 220000 miles. Recently the speedometer started jumping from 70 to 55 and back. It doesnt do it all the time though. So I replaced the speed sensor on the top of the rear end. The problem still persists. At this point I am thinking that its either something in the rear end, wiring or the speedometer cluster in the dash. I talked to a mechanic here in town and he said he has never seen that in a Ford. I think it has to be something mechanical over wiring though. What do yall think?
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Old 05-16-2013, 01:08 AM
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Check to make sure there is no water in the sensor and that the tone ring on the rear diff is tight.

When you changed the sensor did you check for metal shavings? Did you use dielectric grease on the electrical connector?
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Old 05-16-2013, 01:26 PM
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There are only a few components that can cause that issue. You already eliminated the VSS but it could be the cluster, wiring or the tone ring. Pull the cover on the diff and spin the carrier around so you can check the teeth on the tone ring.
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Old 05-16-2013, 01:28 PM
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Are you running a truspeed to recalibrate your speedo for larger tires?

Find a scantool or a buddy with AE. See if there are any codes...
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Old 07-22-2013, 05:45 PM
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Well it took awhile trying to find somewhere and someone where I could find a good replacement gauge cluster. Ford want $600, so I told them they can shove it up there ***. Also the parts guys seem like they do not know anything about any truck older than a 6.4l. I found a company called RT Grim that hooked me up with a cluster with the correct miles and everything in working order. I installed a new gauge cluster this evening and still the same problem. I have already taken off the differential and looked everything over, to me it looked ok. I guess its something with wiring now, I may still replace the tone ring. I hate wiring.
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Old 07-22-2013, 08:52 PM
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Check the tone ring really carefully. I worked on one a few years ago and didn't spot the few slighty bent teeth the first time I looked at it.
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Old 07-24-2013, 08:29 AM
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I got it figured out. After taking everything apart and putting it back together last night I found the problem. My pickup has the compass, mpg and miles till empty option in the console on the roof. I unplugged it and drove to town with no speedometer bouncing. I reached up to plug it in and as soon as I got the plug into the slot the speedo would bounce. So i thought there is either a short in the wires or that computer is messed up. I then remembered that I put in a new computer in November last year and I first noticed the speedometer bounce in December or so. It's not like those were ever correct on mpg but the old one was consistently wrong. When I put the new one in it would sometimes not reset or I would fill up and it would say that I could only drive 114 miles till empty. I doubt it's wiring, I bet it's the computer.
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