2025 Mustang GT coupe vibration at freeway speeds

[smurfslayer]

Lemon laws vary by state. My dad had an electrical issue several years ago, three tries and no fix. I brought up a lemon law conversation, he had one with the dealer and got a brand new car out of the deal with no push back other than a little pleading. So, like always, it depends.....on a lot of things. I wish the OP the best of luck.

Back when I had my LL suit, factory buy backs of a voluntary basis ( that is, not court ordered ) were not just practically unheard of, it was not even a subject brought up. But in recent years - since the 20 teens, all the major manufacturers consider customer loyalty and potential repetitional harm pretty seriously. This is why I suggested engaging Ford CS. They qualify for a state Lemon law on the first try almost any time a hard part is broken - block, transmission, transfer case, etc. Lots of Raptor owners went through this awaiting parts ; on national back order.
Which apparently doesn’t mean that it isn’t anywhere to be found, it means that the parts guys have to go outside their regions and search to find - there’s a term of art here that I’m missing, but more than once I’ve seen a dealership employee suggest a search that lo and behold turned up a ‘national backorder’ part at some dealership miles away. But, if the staff don’t know how to search for these hard to get parts, you’re stuck waiting and the lemon law clock is ticking.

Ford CS has intervened several times to initiate a buy back over the last few years. It’s cheaper for them in obvious cases, and cheaper for you the consumer. 20 years ago, they wouldn’t have given a shìt about the cost, their only concern was to prevail in the lemon lawsuit once it was filed. That means delay, obfuscate, delay, demand evidence, delay, get a deposition, delay, demand a repair attempt, delay, insist they have fixed the problem, and so on. Mine took 15 months file to victory. Plus, once I filed suit, every dealer visit was flagged, and held. No work would take place on the truck until a regional rep approved it, in person (my suit was not against Ford, FWIW). When they showed up, they would perform an inspection to check for abuse, neglect, modification or anything that could give them an out on the warranty. Once I had to wait 3 or 4 days just to get service done. Whereas if you go through the customer service team, they are trying to keep you as a potential customer, not bankrupt you or outlive you.

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[AZ_Ryan]

I get the difficulty of proving a lemon law if the problem is any bit subjective.

My new GT is smooth as silk at any speed. I guess I should feel lucky.

I would think if you have vibrations, it can only be a few main areas.

Out of balance wheels/tires
bad driveshaft
bad bearings?
bad/ loose struts?

I would add half shafts to that as well.

I have heard of a few 2024s that were shipped with a bad rear strut. But the symptom for that was always a mysterious rear rattle noise.

 

[LouG]

Another thought, it's possible to have internal tyre faults like belt separation that does not show as out of balance or not running true. It's rare, but has happened.
Try and get the dealer to try another set of wheels of a car that runs smooth.

 

[MAT1955]

@Mu2ken ..... I have read a lot of this thread and great suggestions from members. Wheel balancing, out of round tires/rims, slipped belt in a tire etc. I'm sure you have done this as it's so basic but sometimes basic gets overlooked. A year ago a buddy bought a new Mustang GT. He told me it rode like crap compared to mine. Took me for a ride. He was right. Things rattled in the console, even the LCD screen seemed to rattle. The car clunked over any road imperfection. back at his place I scrolled through his screens. I noticed his tire pressures were waaaay off on two tires. We let the tires cool overnight. In the morning two tires were set at 32 lbs. Two were set at 35. They were on opposite sides of the car. Lonnnng shot but thought I'd suggest. My money would be on a drive line component. I have friends who had cars "rustproofed" with the waxy or black undercoatings that got on a driveshaft and you'd think the car was coming apart. Good luck on your hunt for the cuilprit.

 

[Winnie]

Anytime!
I Would love to show someone what it's doing. There's another car in Gallatin TN that has the same issue that I'm aware of and there were numerous others online with the same issue.
It's not my first rodeo with automotive development etc. I was one of the original founders of BBK Performance, I retired back in 2020. I've dealt with NVH engineers through the years and know how precise and dialed in they are about NVH issues, thats why it blows me away that they're saying they're ok with it at the Ford level, the dealer agreed with me that its definitely an issue but they just sell the cars, they don't engineer them! All they're telling me is what Ford engineering is telling them.
In no world would an engineering team drive the vehicle on the smoothest roads and experience a buzzing that creates an audible drone and vibrates the rearview mirror so badly that you can't see any detail in it.

Wow, that’s wild—crazy there are others in Gallatin and online with the same issue. Having that many people noticing it? Definitely not just a fluke. And coming from someone with your background at BBK Performance? You *know* what’s normal vs. a red flag with NVH. For Ford engineering to brush it off when it’s bad enough to mess with the rearview mirror visibility? That’s wild. Dealers being stuck between you and the factory has gotta be frustrating. Hope more reports pile up and they’re forced to address it—you’ve got way more credibility than they’re giving credit for here.

 

[turtletim]

Just another data point , after reading this i took mine out for the first time and went all the way up to 90 mph. It seemed very smooth with no excessive vibration. Only a slight drone on top of the exhaust noise which seemed normal to me. I only have 300mi so far but the car seems as happy as I am. I hope you find the fix. It may help many down the road.

 

[turtletim]

I have about 300mi on mine with Brembos. I took it up to 90ish mph for the first time after reading these notes. It seemed smooth and didn't notice any vibration. I will keep looking at it when I drive it but don't notice anything abnormal yet. FYI its a manual if that matters.

 

[turtletim]

Whoops didn't think the first post made it.

 

[Mu2ken]

Update: I drove a brand new same equipped GT and also a brand new bare bones GT, the same equipped had a slight vibration at the same speed but definitelyless than mine, the bare bones base GT had almost no vibration at all at that speed.
Dealer ordered a new driveshaft so waiting to bring it back to have that installed, I'll keep everyone posted on it.

 

[AZ_Ryan]

Update: I drove a brand new same equipped GT and also a brand new bare bones GT, the same equipped had a slight vibration at the same speed but definitelyless than mine, the bare bones base GT had almost no vibration at all at that speed.
Dealer ordered a new driveshaft so waiting to bring it back to have that installed, I'll keep everyone posted on it.

Interesting. I wonder if it's the torsen differential.

 

[steveo1960]

Interesting. I wonder if it's the torsen differential.

As someone who has been cursed with either odd vibrations or odd tire wear over the 50 years I have been wrenching I send my sympathies as these are among the most difficult bugs to pin down.. My advice is to level set and start from square one forgetting what has already been done and then document everything and eliminate suspects. These are tough bugs to shoot. You need to be persistent and document everything.

 

[Mu2ken]

Someone wrote a reply about their 2025 Datk Horse having the vibration issue and it being the differential but I no longer see that reply...please repost, I'd like to find out more.

 

[Lo Pony]

I purchased a brand new 2025 GT coupe with the performance package and 10 spd auto transmission. On my first long freeway trip I noticed it has a constant severe vibration at freeway speeds, noticeable starting around 60 mph and increasing with speed to be severe at about 85 mph. I drove it for about 2 hours at speed and it was truly obnoxious! The vibration is so intense that it creates a drone throughout the vehicle and the rear view mirror is literally buzzing, you can't even tell what's behind you as the image is so distorted from the vibration. If you gently place your fingernails against the mirror you'll feel an actual buzzing!
I took it to the dealer immediately, it had about 800 miles on it by the time I got it there and they said that there was an out of round tire, they replaced and said it was good to go. I drove it afterwards and no change whatsoever so I brought it back and they did road force balancing all around and once again said its good to go and once again, no change at all!
I brought it back and told them its unacceptable and that I don't want it back until the issue is resolved. On the last visit I drove a technician through all the speeds and he verified 100% that the vibration is present.
Its been at the dealer now for over a month, they also checked driveshaft balance to no avail. They appear to be working with Ford engineering but not able to come up with a fix, I've spoke to others having the same issue and feel that there is likely a lot of vehicles having the same issue with people not being picky about it and really looking into it?
The dealer ran a vibration analysis tool in the car and then said they did the same on another similarly equipped car from their lot and said the other car did even worse!
At this point I've come to the conclusion that there is something wrong with the vehicles from Ford and that a brand new $65k Mustang should be smooth at highway speeds and that if it can't be alleviated that Ford is going to be taking the car back as I refuse to accept a severe vibration as "just how they are"!
Also, when at speed with vibration occurring shifting into neutral results in no change to the vibration and droning sound, same goes with placing the exhaust into any of the 4 different sound modes, no change at all.
I've also in the limited time driving this car(it has about 1,200 miles on it) have seen some issues with the Electronic systems as well that I've seen others post about. Sometimes it takes forever for the screen to boot up, settings I've programmed just go away etc.

I have posted extensively about this particular topic on this forum, it’s been quite a while though.

—-does it remind you of the sound of turbo prop airplane makes? Kind of like a subwoofer bass note, buzz or a droning sound? Does it sound like a propeller? If yes, it is the drive train. This is a second order harmonic, resulting from imbalance or tolerance stack up between the driveshaft and the differential flange. There are many reasons why this is happening, they all involve the driveshaft and the differential.

or, does it more resemble a shake or shimmy? If so, it is your wheels, tires, spindles, hubs, etc.

 

[Zig]

I have posted extensively about this particular topic on this forum, it’s been quite a while though.

—-does it remind you of the sound of turbo prop airplane makes? Kind of like a subwoofer bass note, buzz or a droning sound? Does it sound like a propeller? If yes, it is the drive train. This is a second order harmonic, resulting from imbalance or tolerance stack up between the driveshaft and the differential flange. There are many reasons why this is happening, they all involve the driveshaft and the differential.

or, does it more resemble a shake or shimmy? If so, it is your wheels, tires, spindles, hubs, etc.

My question is: how do you get them to ‘road test’ something in excess of the posted speed?

 

[Junkyard Dog]

What is it like at 120mph?

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