[thebmw]

When driving, especially in higher speeds, I'm noticing rhythmic vibrations from what seems to be the drivetrain. At 80 mph, the oscillations of the vibrations are spaced out around one second. That oscillation goes down as the speed goes down. This seems to be coming from the drivetrain. It is not coming from the wheels. There's no way that it could since it is once a second at 80 miles an hour. It seems to go away when I accelerate and come back when I cruise.

The vibration feels like going over very small rub strips on the road. For reference, the car is a 650 GC xDrive. I'm wondering if it has something to do with the transfer case or guibo joint? Or maybe differential? It just seems odd at the very exact spacing between the rhythmic vibrations (which is a great name for a band LOL).