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  #1  
Old 02-05-2011, 07:34 AM
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Speedo problem

I have been having a problem with the speedometer acting up. (Jumping around a bit) so far I have replaced the Speedo, sensor and pigtail for the sensor I can not find any bad wires. I pulled the rear cover and cleaned and inspected tone ring all looks good no missing teeth. So I am still at odds needle still quivering and @ 80 goes nuts.
So I am stumped! Where is the abs box and can I unplug it and see if it could be causing the problem? What else it there??
If I try and use the cruse it is not happy you can feel it trying to comp for the Speedo.
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Old 02-05-2011, 10:51 AM
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Could be the PSOM. Check the junk yards for a OBS 150-350 or bronco, pull the speedometer from the cluster and swap it.
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Old 02-05-2011, 11:12 AM
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i already have one doing the same thing. at same speeds
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Old 02-06-2011, 07:57 PM
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had the same problem,tried the same fixes. then trashed the l/s when i had machine shop do the bearings the tone/abs ring was bent mystically somehow. anyway according to the ford mechanic the ring is a soft metal that can warp from heat (heavy towing, offroading) new ring and havent had the speedo jump or cruise surge sense.
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Old 02-07-2011, 08:10 AM
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Hate to ask what that cost. but what did it cost?
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Old 02-07-2011, 07:05 PM
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50.00 from ford for the ring , r& r the third member. unless you need to replace ring & pinion or bearings you would just be replacing tone/abs ring . keep your shims the way they come out, dont bang the bearings. the ring is r&r with a hair dryer,(you dont need to use high) that is how sensitive it is . i wont tell why i had to barrow a hair dryer to do mine
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