Great Mike, I'm glad you saw this. I read so many of these that I remember the incident but forget who posted it. I hope this helps Wess.
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kenwear. Welcome to the Forum. That sounds like you found a good work around.Purchased a 2007 Excursion about a year ago. About 180k miles. Have the same vibration between 40 - 50 mph or at a lower RPM. I take it out of over drive, RPM's will increase a bit and it goes away. Then when at 60 put OD back on and smooth sailing. No clue what causes this. Have read the many threads here but nothing conclusive. No way to check tranny fluid, I did read somewhere that changing out the fluid helped. One of these days will run it by my shop.