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Speedometer Malfunction

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Old Feb 22, 2008 | 10:46 AM
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Speedometer Malfunction

I was driving the other day (at 60 mph) and all of a sudden my speedometer dropped to 35 mph. I stopped the truck and the speedo still said 35. What could be the problem? Thanks for your help!

BTW THe truck is a 97 4.2L V-6 with an auto trans.

Thanks again!
 
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Old Feb 22, 2008 | 11:33 AM
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Your speedometer is driven by a cable that gets its reading from a plastic gear in the tailshaft of your transmission. I would suspect the cable or gear has broken...or you have a problem in the cluster. I'm not sure of how it attaches to the cluster though...
 
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Old Feb 23, 2008 | 01:15 PM
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I thought it might be a broken speedo cable, but the problem is intermittant, I should have mentioned that above, I think it's probably the cluster too, I just figured I would get some input from you guys here.

Thanks
 
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Old Feb 24, 2008 | 12:44 AM
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Might be a stripped gear inside the cluster. It will catch sometimes and read just fine, but then it will hit the spot where the gears are stripped and stop working.

Just a thought...
 
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Old Mar 2, 2008 | 07:24 PM
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I do believe now that it's the cluster. I replaced the speed sensor (speedometer is not cable driven) and the truck still has the same problem.
 
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Old Mar 2, 2008 | 07:32 PM
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bushing on the needle (indicator) is sticking. or needle dragging the plastic case.
 
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Old Mar 2, 2008 | 07:40 PM
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http://cgi.ebay.com/ebaymotors/FORD-...spagenameZWD1V

Will this work in my truck? It looks identical but as the ad states it is out of a van.
 
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Old Mar 2, 2008 | 11:39 PM
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From: SW VA
Originally Posted by 97obxwhite
I do believe now that it's the cluster. I replaced the speed sensor (speedometer is not cable driven) and the truck still has the same problem.
Uhhh...'97 and '98's should be cable driven (I'm 90% certian). Where was the sensor that you replaced?
 
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Old Mar 3, 2008 | 06:06 PM
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It was on the driver side of the tailshaft housing. I did not see any speedometer cable.
 
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