Hey guys, My 2012 Infiniti g37x AWD has been vibrating on the highway between 60-80mph for the last 2 years and it's driving me absolutely nuts. Both the steering wheel and the cabin vibrate, not just the steering wheel.
I tried the following but none of them worked:
I had 3 tire shops check my wheels and none of them are bent
New tires and had them force road balanced 2 times
New front wheel bearings
New front strut assemblies
New brakes and rotors
New NGK spark plugs
New valve cover gaskets
I rotated the tires twice but that made no difference whatsoever
If I take my foot off the gas, the shake is still there, so I think that this eliminates the driveshaft
I can feel the vibration in the steering wheel, the place where I rest my right leg to the right of the pedal, and the front seats.
Has anyone had this issue and managed to fix it? I'm really considering selling the car because nothing seems to work.
If anyone has any helpful information please let me know as it's driving me crazy.
Thanks in advance.

 

I am going to try to help and also provide some insight for future forum users, so bear with me 😊

The typical way to narrow down a vibration is to discern if it is in the front (steering wheel shakes or vibrates) or the rear (the rest of the car vibrates but the steering wheel doesn’t). Seems you have done that by noting that the whole car vibrates

The next step is to classify the frequency of the vibration. Then think of something on the car that spins at the same frequency as the vibration.

A high frequency (almost buzzing feel) could be related to a front or rear drive shaft, transmission input or output shafts, transfer case, etc.

Lower frequencies tend to be tied to axle shafts, CV joints, wheels, tires, etc.

Hope this helps and keep us updated!