Rearview mirror image shakes at high speed

[JHN52]

Since their air two adjustment points on the mirror, try moving the upper adjustment point and readjusting the lower point to put the mirror to where you can see.

What you have most likely found is the harmonic resonance of the tuning device(mirror). Your car is producing some frequency at that speed that matches and amplifies the shaking of the mirror. Like a previous poster mentioned a blend mount (weight) or trying to change the leveler angle(tuning length) could clear up the issue.

Funny enough another way that might work would be to take off a wheel weight to introduce a different vibration.

Perhaps you're right. Thanks.

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[ILStang]

Along the same lines as removing a wheel weight, simply rotating the tires could potentially change the harmonics/vibrations.

 

[Rapid Red]

so you're concerned about doing 95mph and needing a clear image in the rear view mirror?

Yeah should be watching the road LMAO, I am sure the OP never drove a Harley more LMAO

 

[Son of SVO]

Hi all, I'm always interested in vibration threads hoping to get feedback that might help with my own issues. I've had what seems to be different vibrations at speed with my car almost from new. Did all the usual stuff with wheels tires, balance, tire pressure, etc. Certainly helped . I had a serious cowl shake with mirror shake 75-85 and just couldn't figure it. Last fall in the course of normal maintenance I had all four brake rotors, pad and hardware replaced. Boom! Cowl shake gone! Must of had an out of balance rotor! My car is a Handing Pack car with the aggressive front pads. Both rotors were quite worn when I replaced them.
Something else to think about. Rotors spin with the wheels and tires, after all...

 

[Oakley]

you guys really are overthinking the shit out of this. its not a Bugatti.

 

[BlackandBlue]

you guys really are overthinking the shit out of this. its not a Bugatti.

Interesting you stopped by to think of a way to say we are overthinking something…

Actual thinking could have stopped your comment. Also capitalize or I think you are a trained money on a keyboard which judging by your comment……

 

[JHN52]

Along the same lines as removing a wheel weight, simply rotating the tires could potentially change the harmonics/vibrations.

I understand.

 

[Oakley]

Interesting you stopped by to think of a way to say we are overthinking something…

Actual thinking could have stopped your comment. Also capitalize or I think you are a trained money on a keyboard which judging by your comment……

you think this is a legit warranty concern?

compile data. do a survey. i bet you a buffalo nickel every PP1 or greater non magneride car does this and maybe even those with the fancy suspension.

 

[JHN52]

Hi all, I'm always interested in vibration threads hoping to get feedback that might help with my own issues. I've had what seems to be different vibrations at speed with my car almost from new. Did all the usual stuff with wheels tires, balance, tire pressure, etc. Certainly helped . I had a serious cowl shake with mirror shake 75-85 and just couldn't figure it. Last fall in the course of normal maintenance I had all four brake rotors, pad and hardware replaced. Boom! Cowl shake gone! Must of had an out of balance rotor! My car is a Handing Pack car with the aggressive front pads. Both rotors were quite worn when I replaced them.
Something else to think about. Rotors spin with the wheels and tires, after all...

Something to look at. It is a 2022 GT Premium 6-spd with PP1 and PP2. Only has 4,000 mi. Tires are always at 32psi.

 

[JHN52]

Folks. I'm really sorry to launch a thread that causes friction. When/if I discover what it is, I'll return and close this out. In the meantime, enjoy Spring wherever you are.

 

[KingKona]

Since their there air are two adjustment points on the mirror, try moving the upper adjustment point and readjusting the lower point to put the mirror to where you can see.

What you have most likely found is the harmonic resonance of the tuning device(mirror). Your car is producing some frequency at that speed that matches and amplifies the shaking of the mirror. Like a previous poster mentioned a blend mount (weight) or trying to change the leveler angle(tuning length) could clear up the issue.

This.

I had the same issue. Doing this fixed it. It's just an odd harmonic vibration that adjusting the mirror a bit will tame.

 

[NCAMG]

Had the same issue with a 2019 Bullitt. Dealer replaced mirror no difference. Bought a $12.00 mirror from Amazon no difference. I then adjusted the mirror and epoxied the swivel joint. Problem 90% fixed. I know this doesn’t shed light on what the problem is but there is a fix for me at least.

 

[NCAMG]

BTW of the five cars I own only the Bullitt had the mirror vibration and the only car with the mirror attached to the windshield.

 

[GregO]

I have a 2022 GT, 6 speed, PP2, with 5,000 miles. At speeds between 80-95mph, the rearview mirror image starts to vibrate such that the image appears to bounce and become blurry.

The S550 body is a very rigid structure and is like a tuning fork that picks up a bunch of different frequencies.
You might want to consider having a conversation with your dealer asking to rack the car and having the Differential pinion yoke runout verified with a machinist dial indicator.
You should also ask to have the driveshaft sent out for balancing validation.

I hope this helps.

 

[melwff]

I suffer this as well, again wheels balanced No steering shaking or other …my bonnet vibrates at speed

If only bonnet/hood, install a pair of hood gas strut supports such as Redline

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