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@Northshore, please post any results.
I've replaced both the control arm/tension strut and lower wishbone along with the sway bar and sway bar end links. No changes.
I've replaced the rear GUIBO with no change either.
As I've thought about everything that's rotating, Engine, Transmission, Wheel Bearings, Drive Shaft, Rear Axle, Wheels, I feel as if the drive shaft is the only thing left.
My engine is new and the mounts are good. The engine is solid in the bay and when I rev the engine while in park, it sits nearly still. I know bad mounts will allow the engine to move when revving and you'll feel vibrations it in the car at idle.
The transmission is good. I've dropped gears, revved the engine and put the car in neutral while driving and there was no change to the frequency of vibrations, so I'd say it isn't related to transmission speed, the torque converter, etc.
The wheels are good. I've swapped wheels and the vibration is still there.
The wheel bearings are good. I've had bad bearings and the noise is always noticeable when they are going bad and my car is quiet when driving.
The rear axles seem to be good, but who knows. I've put the car on a lift and let the wheels rotate in drive and the axles seems to spin fine. I've replaced the rear differential bushing as that is known to cause vibrations, but no change.
The driveshaft seems to be the only thing left. The shimmy/vibration is felt inside the car, not the steering wheel. How/why it's bad, not sure as it feels good and the u-joints seem tight. While it's a pain to replace (need to drop the exhaust), I might grab a used one on eBay (which are surprisingly inexpensive) to see if swapping it out, solves the issue. If not, I'm out of ideas.
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