08 GT. Automatic 87,000 miles. I have this fairly audible creaking sound from in front end during take off from a dead stop. Don't hear it when I first start driving, but it will start after driven for a while.

 

Thee is a TSB on this.
If your car was built before 10/06 Then you need to replace your limited clutch pack.

If not you just probably need to add some friction modifier to the rear end.
Other than that you may have broken a bar.

Take it in and have them inspect your front suspension
If all looks ok just add some friction modifier then do some figure 8's at low speeds to force the modifier in.

I just got through doing this on my 08 Shelby.
I had the new clutch pack already and the culprit was needing the friction modifier.

Good luck!