I hope you did not have to pay any of those mechanics. Did any of them put the car on a lift and run the vehicle? Most of the time you can pinpoint the sound with the vehicle in the air but not always. Sometimes it needs to be on the ground to have the weight of the car on the tires. There are so many things it could be but let me give you a few based on the information I have.
1. sounds stupid hub caps can make noise on the car while rotating, easy to check take them off and drive the car.
2. the brake rotors have a thin metal plate behind them. check to make sure they are not rubbing on the brake rotors.
3. Some axles have a center support bearing- I am not sure about this particular vehicle. Check that.
4. check to make sure the axles are not rubbing on something.
5. Drive the vehicle and pay attention to what the noise does when you accelerate, decelerate, or turn the vehicle. Also put the vehicle in neutral while coasting does this affect the noise. Is the vehicle hot or cold when it happens? Does the transmission shift right.
Number 5 are all of the things you should relay to a mechanic. I would take the vehicle to a transmission shop because they deal more regularly with noises in the drivetrain.
Look for the simple things. And most important how did the noise come about. Did it appear from no where or did it slowly get louder. Did someone work on the car and it started after they? Did you put new rims on the car? Are the rims on the car factory rims that came with the vehicle. Did you get in a wreck. Good luck and I hope you find a good mechanic.
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