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even though po722 is an out put signal code, Did you make sure the torque converter rubbed on the inside of the transmission case when you installed the engine? The torque converter has a two step input when getting it to engage into the transmission oil pump. If the torque converter isn't engaged it to the transmission pump all the way than you get nothing. No output.... = torque converter not in all the way = No input No out put. Or the pins have backed out of the trans connector "Look Closely" Or you tore a wire. That's about it.



When you spun the torque converter it should have rubbed a little on the inside of the Bell housing/trans case. That way you know the TQ is engaged in the pump all the way before reassembly.
 

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Your talking the torque converter should have been rubbing against the back of the case, the front being where the bell housing meets with the engine.

I don't recall it rubbing but I do recall when spinning the torque converter in it would spin around until it dropped down onto those two notches. I couldn't get a finger in behind it.
Thats Great then. You just need to Inspect that harness over every inch. & especially the pins at the connectors. I've found quite a few backed out.
 
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