71 f250 speedometer issue
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71 f250 speedometer issue
I have a 71 f250 with a speedometer issue. It had a broken speedometer gear. So I replaced it and the cable. But when I accelerate it goes straight to 100, when I reverse it goes because to 0. Could it be the speedometer gauge it self Or the gear in the tranny? I don't believe it's the gear in the tranny since it moves the speedometer any help is appreciated.
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Joined: Aug 2003
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From: **** hole San Jose ca.
Those gears are all color coded, so did you replace it with the same color & tooth count?
Mind was bouncy and tried to smooth it out by lubing cable checked the tranny gears.
So after 30+ yrs I was feed up and made a custom dash, plus switched over to a electric speedometer
Orich
Mind was bouncy and tried to smooth it out by lubing cable checked the tranny gears.
So after 30+ yrs I was feed up and made a custom dash, plus switched over to a electric speedometer
Orich
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You probably just need to trim some off the cable at the transmission end. It is likely just binding because it is too long. I have just recently replaced the cable in mine and had to trim about 3/8" off in order to get the gauge to work properly.
Marty
Marty
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Could I maybe have to trim off the gear it self because at the end of the plastic tip it's black
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When you trim the cable how does that help it. Just wondering. To educate myself more.
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From: Simi Valley, CA
One size does not fit all. There are several different lengths of 1971 F250 speedo cables, which cable did you buy? 2WD or 4WD, 3 M/T, 4 M/T or A/T?
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From: **** hole San Jose ca.
I'd say what Marty69 has done was trim off a little kink/shape bend of the outer cable housing where it goes into the cable end to the tranny adapter end.
But really should have replaced the whole outer & inner cable to have may a longer term fix..
orich
But really should have replaced the whole outer & inner cable to have may a longer term fix..
orich
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Inside the speedo cable housing is a woven steel core. It supposed to be lubed every so often, but most people are unaware.
When the lube dries out, the woven steel core binds up inside the housing and snaps.
Instead of replacing the speedometer cable and housing assembly...
Auto parts stores sell a 'universal' woven steel core kit. Cut it to length, coat with a fine film of graphite, install in the housing.
When the lube dries out, the woven steel core binds up inside the housing and snaps.
Instead of replacing the speedometer cable and housing assembly...
Auto parts stores sell a 'universal' woven steel core kit. Cut it to length, coat with a fine film of graphite, install in the housing.
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More specifically what I had to do was trim the inner steel core driving part of the cable (the squared end). Without doing this, the cable was bottoming out in the transmission speedometer drive gear when the outer cable nut was tightened up. This caused excessive flutter of the speedometer needle and failure to return back to zero when I stopped.
Thread Starter
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New User
Joined: May 2014
Posts: 7
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Inside the speedo cable housing is a woven steel core. It supposed to be lubed every so often, but most people are unaware.
When the lube dries out, the woven steel core binds up inside the housing and snaps.
Instead of replacing the speedometer cable and housing assembly...
Auto parts stores sell a 'universal' woven steel core kit. Cut it to length, coat with a fine film of graphite, install in the housing.
When the lube dries out, the woven steel core binds up inside the housing and snaps.
Instead of replacing the speedometer cable and housing assembly...
Auto parts stores sell a 'universal' woven steel core kit. Cut it to length, coat with a fine film of graphite, install in the housing.
Thread Starter
|
New User
Joined: May 2014
Posts: 7
Likes: 0
More specifically what I had to do was trim the inner steel core driving part of the cable (the squared end). Without doing this, the cable was bottoming out in the transmission speedometer drive gear when the outer cable nut was tightened up. This caused excessive flutter of the speedometer needle and failure to return back to zero when I stopped.
