As do the GM vehicles with this transmission.Ford is working on a TSB. There are a couple guys on SVTP that have the same problem as well. I work with Fords Media/Press vehicle fleet management and I brought the problem to their attention with our '11 GT500s. The Ford PAVE team also knew about the issues, and I was able to confirm them with a couple of 1-2 WOT blasts. Hopefully the TSB will be for a Carbon Fiber 2nd gear syncro, and not just a trans replacement.
It is a Tremec TR6060 problem. Dodge had the same issues as well.
A lot of people were able to "drive around" the problem by making sure the pedal was depressed all the way. In truth, I don't think this is a FORD problem, but rather a Tremec problem.I am having the same problem with my 2011 GT500 as well. It seems to be worst when the trans is cold. Once things warm up it is improved. It will do it an any speed and any RPM on the 1-2 shift.
Ford told the Tech at the dealership that I should be sure to move the seat up 1". They also said to make sure I had the clutch pressed down all the way.
It seems they are in denial that they have a problem.