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I just started have a shift problem when weather got hotter I have checked my actualor valves nine sticking I check and looked for codes with AE ford Inhanced. I did find out that 1& 2 silnold would stay on so replaced all and cable.
I have looked over all forums and have found nothing. But when over 125 if I rev to the limiter and let off it will shift, I can’t manually shift in to 2 either. Oil looks good no partials in pan at all. I spoke with a good tranny guy that said I should take a heat gun and check valves with heat applied (yes it will be removed) I’m using oreallys global (I think this is the problem) my order of Amsoil will be here tomorrow. I have replaced my VVS also. Does anyone else have any suggestions.
 

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Former Ford Trans Engr.
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Is this a 2001 7.3L? If so, you most likely have a failed mechanical diode one way clutch. That requires a rebuild to fix. You must replace the mechanical diode with a sprag type one way clutch.
 
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