24 Dark Horse high frequency highway vibration

[Shneakyman]

Hello all, purchased my 2024 mustang dark horse a few months ago and recently within the past 2-3k miles it has had a pretty noticable high frequency vibration starting at 60-65mph and getting worse as speed increases. Feel it more in the chassis of the car( floor, doors, console, roof) not much in the steering wheel. Pressing the brakes doesn't change it and can put the car in neutral without any change. The vibration is also accompanied by a low rumbling/hum noise, almost like bass feedback. Dealership has had it twice for almost a month. They have "rebuilt" the rear diff, replaced the driveshaft, and balanced and replaced tires. Nothing has helped the vibration and I have been told that's just how Mustangs are.

I'm pretty confident that it is in the drive line but haven't seen many that have successfully fixed an issue similar to this. A few filed lemon law but I have seen one that they replaced "the back whole axle" and that's all the info they gave. Wasn't sure if anyone has experienced this or knows anyone who has. Just trying to help point Ford in the right direction. Thanks! Oh and car has 29k miles, non HP, and stock other than an X-pipe.

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[Sofa King]

Could be a wheel bearing... do a couple of quick side to side turns and see if there is more noise to one side or the other.

 

[Shneakyman]

Could be a wheel bearing... do a couple of quick side to side turns and see if there is more noise to one side or the other.

Doesn't change side to side. And the dealer checked all 4 and said they were good.

 

[MAT1955]

@Shneakyman ..... so you have an X pipe. Did your DH come with this? X pipes are known to have "special effects" aka rumble, vibration, etc. at certain rpm/mph ranges. H pipes don't seem to be prone to the "special effects" afflictions of X pipes. Do you know the history of your DH? Was it ever in an accident? Have you had a 4 wheel alignment which should rule in or out frame damage - even very minor frame damage or suspension damage from an accident can cause vibrations/noises at different speeds.

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