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Discussion Starter · #1 · (Edited)
So about three months ago I had to pull the tranny to replace the flex plate in my 2012 f350 6.7. All was good for about a a week after I did the deed. Then the tranny began to miss gears and shift, for example, from 2nd to 5th gear. Occasionally, as I'm driving it will go to 5th gear and stay there until I pull over, turn the truck off for a few minutes and then restart and everything is good again. Over this period, if I drive very gingerly, the tranny is fine. But as soon as it's under load or if I get on it a bit it acts up. I've done a def delete so the Ford house will not even put it on their diagnostic tool. I've got a SCT scanner and it throws no codes.

Thoughts on what could cause this? Would replacing the transmission control module solve the problem?
 

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Check, clean, dielectric grease the connectors and reassemble. That would be my first trouble shooting attempt.
 

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My guess would be the solenoid pack needs replacing.
 
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