I have the shake at 80 MPH. Dealer did the transmission flush and told me to drive 200 miles. I still have the shake and it hasn't gotten better, even after 500 miles.
They refuse to look at this issue because the speed limit is 65 MPH on the closest highway and the issue is at 80 MPH. I remember a speed limit of 80 MPH when I was driving through Texas. I shouldn't have to drive back to Texas from Florida to have a dealer diagnose this issue. Does anybody know how to handle a situation with the dealer like this? I offered to drive and they declined, saying the tech wouldn't feel comfortable at that speed. I told them that the shake exists at 80 MPH and I have video to show it and the speed is irrelevant to having somebody get started in diagnosing the issue, checking the driveshaft, the suspension components, etc.