Hi,
Have you been able to inspect rear suspension components for wear or damage? I attached a pic below showing things that can cause a problem.
As far as the vibration at 50 and 60mph, do you feel that when the brakes are applied, or does it happen regardless of the brakes?
If it doesn't require the brakes to be applied, chances are it is the result of tire balance or a bent rim (in the front of the vehicle). If it happens when the brakes are applied, then suspect warped brake rotors.
Let me know exactly what is happening. Also. Let me know if there are any noises associated with the issues.
Take care,
Joe
See pic below.
Image (Click to make bigger)
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Wednesday, June 7th, 2023 AT 7:22 PM