One problem related to transmission not go into gear has been reported for the 2005 Mercury Montego. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Mercury Montego based on all problems reported for the 2005 Montego.
I own a 2005 Mercury Montego fwd 6 speed. A couple months ago the transmission started jumping around, it seems like it would not go into to gear and when it does it will slam real hard. I bought the car used with 22000 miles and now it has 52000 miles. I've already replaced a motor mount because of the hard shifting. The dealership told me that it might be the valve body witch is around 2000 dollars with parts and labor. From what I have research about this car, it is a major issue and could get someone hurt. I purchased this vehicle for my wife and kids so it has not been mistreated. There is something wrong with the transmission to start going out around 50000 miles. From what I have read on the forums this is a problem and for the transmission to all of a sudden not want to shift right who's to say someone gets hit because they couldn't get out of the way in time. I have always owned a Ford and this car is the worst. As soon as I save the money up just so they can even look at it we are out of a vehicle.