Car vibrates at 73 miles per hour had driveline changed both lower control arms changed both wheel hubs changed
What does that mean?? Driveshaft assemblies?? The driveline means engine, transmission and all parts to the wheels. I doubt these all have been replaced.
Based on what you’ve already had changed,
Check: Tire balance, or bent wheel, motor mounts.
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Might or might not be tires.
Swap the tires front to rear. If the vibration moves from the steering wheel to the seat back (or vice versa!), then one or more of the tires and/or wheels is the issue.
If no change, then it is something else.
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