I am not familiar with the Ford tranny issue but I will tell you a past story and make a suggestion. I had a 97 gmc 2wd and my daughter needed a new vehicle . I was in a better spot to buy one than her so I told her I was buying a new one and she could have my old. Low miles, bought new, good history. Long story short she was 300 miles from home, parked, got back to the truck, started it, put it in reverse, a sharp snap occurred and it would not back up.
She calls me, I call my local trans shop that does all my services etc, explained what happened and he says, oh yeah, there is an issue with a drum that cracks, the new drum is built different so it doesn't do that, $900 to fix bring it over.
I call her, tell her what he said, had her find a local to where she was shop and tell them the story. She calls back shortly and said that they told her the same thing and $2700 to fix,,hmmmmm maybe because she is military in a military town??? I go borrow a buddies trailer, drive 10 hours round trip, buy her a $79 flight home in a week and it was fixed 2 days later for under what his estimate was, and it has been fine since, and that was 3 years ago.
My suggestion, if you don't know a local shop ask buddies if they know of any. go talk to them, see if there is an updated piece and have it put in. It will be much less stressful while you are at home, you will pay less, you have a few months to drive it and make sure all is well and then take that little girl on the trip she will remember forever.
If you don't do something with it every time it shifts you are going to think something happened and you will be worried and she will sense that.