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2001 PSD 4R100. Getting hard up shift, codes P0781 and P0782. What could cause that?
 

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Those codes mean there is a problem with both the 1-2 shift and the 2-3 shift. Seeing as you have a 2001 diesel I suspect you have a failed Mechanical Diode one way clutch. That's takes a complete rebuild to fix.
 
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