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Discussion Starter #1
1997 F-250 HD 7.3.
Intermittent OD light flashes and transmission shifts hard. When is happens, if I reset the trip meter, everything goes back to normal. Does this make any sense? Already changed vss and pigtail and cleaned inside rear diff. Do I need a new cluster/psom??


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Former Ford Trans Engr.
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No, that doesn't make any sense. Are there any codes stored when the light flashes?
 

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Discussion Starter #3
Code was for vss sensor. Changed sensor and pigtail. Since vss is wired into psom along with odometer, I thought maybe there was a psom issue?




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Former Ford Trans Engr.
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There may be a PSOM issue.
 
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