The vehicle has a vibration at interstate speeds 70-85 mph. The dealership has rebalanced the tires that came on the car, installed new tires and road forced balanced, replaced transfer case, rear drive shaft, but different size tires on car, and done another road force balance on the 2nd set of new tires that were put on car. FSE told dealership to give the car back to us and there was noting else they will do even though vibration still remains. Dealership put in it’s service notes that the condition still remains, but was told to give customer back the vehicle. We have put less than 700 miles on the car and dealership has put close to 1100 or so miles on it test driving after repairs each time. This vibration could cause bearings, gears, and drive train failure that could result in potential death at highway speeds. Upon investigating this problem I found this to be a issue with the 2024 Lincoln Navigator throughout the US. I have requested Lincoln buy the vehicle back and was told they would not. My case number with the Lincoln customer service is [XXX] . Teresa 888-214-2155 ext.77992 is the representative. I would ask the NHTSA to investigate this problem for us consumers out here. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)