Speedometer jumping
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Senior User
Joined: Apr 2004
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From: Idaho
Speedometer jumping
I already started a thread on this but I can't find it. I checked with NAPA on a replacement gear behind the guage panel because someone on here gave me the impression there was on to replace at the tranny and behind the panel. They said NO I would need to replace the whole gauge assembly fom a place like LMC. The needle still lunges but the ODO has stopped so I thought it was not the gear at the tranny or the cable because it still gives a speed. Can someone clarify so I know what to replace.
Senior User
Joined: May 2007
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Ditto on the problem. Removed each end of th cable, pulled the metal cable out of the housing (would only come out several feet) cleaned and lightly lubed it. We did this a couple of times and it finally stopped the bounce.. Fortunately there was no damage to the cable housing or we would have replaced it.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Bookman, That is a problem, when you have a popular dummy posting 20 numbers for every post that he reads. He gives you a warm and fuzzy feeling armed with information to take to your local dummy for a problem that may not be diagnosed.
You in fact have a speedo cable inside of a cable housing that is connected to the speedometer on one end and a drive gear on the other. The cable or parts that it is connected to can get dry and need lubing, worn or broken and need replacing.
Many times the grease drys out in the dash area because of the heat buildup from the sun on the dash. I would try the above recommendations first.
John
You in fact have a speedo cable inside of a cable housing that is connected to the speedometer on one end and a drive gear on the other. The cable or parts that it is connected to can get dry and need lubing, worn or broken and need replacing.
Many times the grease drys out in the dash area because of the heat buildup from the sun on the dash. I would try the above recommendations first.
John
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Most autoparts stores sell the inner speedometer cable core as a kit.
Measure it to match the original, cut it, and install it in the housing.
The inner core needs to be greased (a thin coating of white lithium grease, does the trick).
When the old grease dries out, two things can happen.
1) The speedometer needle jumps around.
2) The inner core binds in the speedo cable's housing and then snaps in two.
Measure it to match the original, cut it, and install it in the housing.
The inner core needs to be greased (a thin coating of white lithium grease, does the trick).
When the old grease dries out, two things can happen.
1) The speedometer needle jumps around.
2) The inner core binds in the speedo cable's housing and then snaps in two.
Posting Guru
Joined: Jun 2007
Posts: 1,724
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From: Butler, IN
I already started a thread on this but I can't find it. I checked with NAPA on a replacement gear behind the guage panel because someone on here gave me the impression there was on to replace at the tranny and behind the panel. They said NO I would need to replace the whole gauge assembly fom a place like LMC. The needle still lunges but the ODO has stopped so I thought it was not the gear at the tranny or the cable because it still gives a speed. Can someone clarify so I know what to replace.
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Senior User
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From: Idaho
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Posting Guru
Joined: Mar 2003
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From: nevada
I second trying to lube the cable. Mine was jumpy, and after gettting some speedo lube down the cable, it is nice and smooth.
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Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
If the speedometer driven gear at the end of the speedometer cable where it attaches to the trans is stripped, that can also cause either the speedometer needle to jump around, or not work at all.
The good news is, all the plastic speedometer gears are still available from Ford because the new trucks use the same ones.
There are 6 different driven gears: 16-17-18-19-20 or 21 teeth.
btw: The DRIVEN gear is at the end of the speedo cable, the DRIVE gear is on the transmissions output shaft.
The good news is, all the plastic speedometer gears are still available from Ford because the new trucks use the same ones.
There are 6 different driven gears: 16-17-18-19-20 or 21 teeth.
btw: The DRIVEN gear is at the end of the speedo cable, the DRIVE gear is on the transmissions output shaft.
New User
Joined: Apr 2008
Posts: 8
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From: Cody, Wyoming
You should only have to pull the gauge cluster out, unscrew the screws attaching the printed circuit and remove the printed circuitboard. Then simply remove the head. The last speedo head I bought was at a salvage yard. This salvage yard also guaranteed its operation or they would give me another one.
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