One problem related to transmission stuck in gear has been reported for the 2010 Mercury Milan. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Mercury Milan based on all problems reported for the 2010 Milan.
Under load (acceleration into traffic), the transmission does not engage, stuck between gears causing the car to redline and go nowhere. Also, noticed stuttering in shifting of the car at certain gears. Does this very intermittently, but when it does, it could have been in dangerous situations if I was trying to merge into traffic. Ford service was unable to replicate, but it has done it a half dozen times since the first time I bought the car.