Ford has issued a Technical Service Bulletin for 2011 Mustang GTs equipped with a manual gearbox due to clutch problems.
The problem is that during high RPM shifts, the clutch pedal can become stuck until engine RPM drops to a certain point.This is caused by centrifugal forces reducing the force with which the clutch diaphragm fingers push against the release bearing at high RPM.
Affected cars were built on or before March 25th, 2010, and have low mileage, around 10,000 miles or less. If you own an affected car, don’t worry, this isn’t a safety issue. All this will do is force you to slow down when you’re driving enthusiastically enough to shift at high RPMs.
To fix the issue, Ford will replace the brake pedal and bracket assembly. The fix should be covered by warranty.
Source: Ford via Mustangs Daily