I have a 300 se, with 212k miles I owned this vehicle for the past 6 years.

The vehicle is well maintained and I enjoyed it much for the first 3 years.

In the past 3 years the car is seating in my garage because i don't have the heart to drive it and cause more damage.

The problem with this car is a vibration that starts at about 25-28 miles per hour, it is a severe vibration that you can feel in the driver seat it comes from the back of the car.

My old mechanic tried fixing it and I feel as if I was taken for a ride.

It all started after replacement of the flex disk. by same mechanic.

since then the drive shaft was replaced with a new one, the differential was replaced, transmission mount also replaced, one rear cv axle shaft assembly. The problem still there. I am desperate, I love this car and spent lots of money on it, I want to put it back on the road but the vibrations simply takes the car apart ( loosened up my dashboard)

Please, If anyone knows what can be the problem, Please help

PS- It is not wheel or tire problem, car shakes on the lift without wheels.

I suspect is is the drive shaft but i am not sure and don't have extra bucks to waste.

Thank you very much

I will post the solution once problem solved to help others.
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