Hello all, even though this thread died somewhat, I couldn't help but reply and say i'm sorry you all are having issues with the tranny.
I am new here and I picked up my '11 GT on 31 December 2011. I have not had any shifting issues that is not related to my getting used to the six speed. There was a learning curve their. I have been driving strictly manuals for more than 30 years so, I am somewhat familiar with them. I think I've run into the 1-4 shift thing once or twice but, at the times I did, I just thought it was me miss shifting. Since I'v gotten used to the shifter now, I have had no problems. The shifter in this car is much smoother and less notchy than my Bullitt was although I didn't have an issue with it being that way. I put a Steeda Tri-Ax in it and made it more acceptable.
Anyway, I have found that shifting this thing is pretty easy. When I was learning the ins and outs of it, I was being harsh and direct with it and that's not what you want to do as I found out. Now, I shift using two fingers to second and just a push into 3rd (shifter finds it's own way to 3rd), a kind of throw back into 4th and a somewhat forced and angled push to 5th and 6th. This pattern seems to work for me. I have not had any issues with grinding, until yesterday when earlier I was thinking I haven't chunked a gear in this thing yet. Well, low and behold I did yesterday by not depressing the clutch far enough to get a smooth shift. However, I have not done any aggressive shifting as of yet and this all may change. We'll see.
I find it somewhat laughable that a dealership mechanic would say that a premium package has the "
Hurst shifter" in it. Maybe the shift ball?
At anyrate, I will leave that up to some research to present itself
As far as adding different fluids and such goes, I go with not doing so to protect the warranty. If you have an issue it's probably best to take it in. Also, by doing so, I would do a test drive with a tech with you driving to get the full effect of what ever the problem may be. Don't leave to them to 'give it a try'. 9 times out of 10 they are going to come back with a "we can't find a problem" deal. Good luck to you'all in finding the solution.