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Here is the reply from GM on this issue.
Good Morning! Thank you for sending us an email at Chevrolet regarding the vibration on your 2011 Chevrolet Camaro.
I certainly understand how frustrating it can be to have such a condition on a vehicle. Thank you for bringing this to my attention and giving me an opportunity to assist you. In response to your request, there is a recent bulletin released by GM referencing a vibration or drone type noise for 2011 Chevrolet Camaro.
Condition
Some customers may comment on a vibration or drone type noise at 1150-1200 RPM or 61-72km/h (38-45mph) in 6th gear and TCC on.
This vibration or drone type noise is present at the above MPH range during light throttle application and will remain as long as the engine load remains constant during these conditions.
Correction
The front two rear suspension support (cradle) bushings will need to be replaced.
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