E4OD Issues Codes Ran

[Dexter16]

Hello and goodafternoon,

So I was dricing back from the grocery store the other day and noticed my truck was shifting rough and the OD light was flashing on the shift selector. I plugged a few scanners up to it and no codes.

Brought it to a buddy and he plugged his 3,000 dollar snap on scanner and ran a code for P1728 torque converter clutch failing to engage.

After calling some places they told me to drop the pan and test the solenoids. So I did so, tested them all and the all the resistance was in spec.

Anyone know where I should go next? Ive been told to replace the TC but I do not want to drop the transmission and spend the money on the TC when there potentially could be something else I can check.

I have a 97 PSD 7.3 CCLB E4OD

Any help would be much appreciated. Thanks in advance.

[Dexter16]

I also visually checked the overdrive shift selector wiring down from the shifter all the way to the main harness and everything checked out okay.

[1Dieselman]

Check the main connector on the right side of the transmission. Make sure that it is clean and dry.