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Check wiring all along the harness. If the tranny is shifting up or down suddenly and for no reason there could be a short in the harness. 90's Ford had a problem with this. May need a new harness or have to make one up yourself.

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Q: If speedometer is pulsing and causing auto transmission shifting problems on 1995 f250 powerstroke how do I find Problem in wiring harness I've changed speed sensor checked connections at trans also?
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