Two problems related to transmission shudder have 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.
The car was purchased in may of 2011. August 2011, the transmission started to violently jerk and act as if it were in neutral. When gradually applying the breaks, the car would begin to shudder. This would happen only if the engine was warm. By March 2012, the shuddering transmission and jerk was constant. I took it in to be looked at in April of 2012. The alternator was replaced, due to what we thought was a bad battery. The mechanic believed this caused the transmission to jerk. The problem was not solved. June 2012 the transmission was replaced by a Ford dealership for 5,000. July 2012 the car went into fail engine safe mode, the codes pointing to the throttle body. A mechanic cleaned the throttle body saying it might solve the problem. 2 days later the car went into fail engine safe mode again with the same codes with an estimate of $900. The car has 72000k on it and has had three major problems in the past couple of months.
2005 Mercury Montego premier has been experiencing rough and bucking transmission shifts at 2nd and 3rd gears, very occasional shift into neutral by itself while in motion and accelerating and shuddering transmission shifts during deceleration or braking since approx. 50, 000 miles (25, 000 miles before my extended warranty expired). Dealer service was consulted multiple times. However, I was always told there were no computer codes and that technicians couldn't "duplicate the condition. " therefore, I have lived with the condition since then. That is until this morning when I was almost rear ended and run over by a semi because the transmission shifted into neutral while accelerating on the on-ramp to I 95. This condition is dangerous. I see that there are many others with the same problem on this site and on fordforums. Com. It is a matter of time before this defective transmission fails to operate and causes a serious accident in one of these vehicles. Please, listen and take action.