The automatic transmission may develop shifting concerns. On lower mileage vehicles, upgrading the software in the powertrain control module (PCM) and the transmission control module (TCM) may correct the problem. As the mileage increases, internal transmission damage can occur. Repairs could involve replacement of the valve body or a complete transmission rebuild. Whenever major transmission repairs are made, it is important to be sure the PCM and the TCM have the latest software updates to help prevent these issues from reoccurring.Google+
Car Problem Reports
Mercury Montego Harsh or Delayed Shifting of Automatic Transmission
Mercury Montego Problem
Drive Trains Affected: AWD, FWD
Average Mileage: 89,030 mi (51,651 mi - 153,806 mi)
2005 Mercury Montego: 45,000 miles needs new transmission and already replaced engine mounts...piece of crap - no one will help. No assistance from Ford, Mercury, filed claim with NHTSA...they responded they did not have enough cases...I am going to find enough cases...I am going to contact every internet site, media outlet, etc..until someone takes care of this!
Transmission shift problem, 70% of the time starting out it shifts with a bump. Slowing down to stop the transmission makes a thump going into a lower gear. Backing up in reverse the transmission at times goes into reverse with a serious banging noise, sounds like you are about drop the transmission!
Note: also replaced a motor mount 4 months ago....04/2013.
The car jerks and clunks when it downshifts
Visitor, 2006 Mercury Montego, 90,000 mi
I have had the same problem the majority of the time ive owned this car, Im the 2nd owner. bought it at 80,000 miles started hard shifts at 90,000. The problem has only gotten progressively worse over time at now 125,000 miles. Seems that the temperature affects when this problem will occur, during winter I hardly notice a problem but hot summers and the transmission gets warm there we go jerking and clunking all the time. I cannot even attempt to pass someone at highway speeds when the transmission is hot because even light acceleration will cause the transmission to miss the gear and hesitate and jerk searching for the right gear. Ford deffinately needs to recall these transmissions or at least find a fix for them, it is my understanding 2006 was the first year the 6spd automatic was put in these cars and it was the same motor and transmission used in say a ford focus or simular. If that is the case the curb weight of this car compared to a ford focus is no where near the same thus over time the transmission will get tired if it were not beefed up to contend with the extra stress on the motor and transmission.
Visitor, 2006 Mercury Montego, 62,000 mi
When car downshifts it jerks and clunks.
Visitor, 2005 Mercury Montego, 114,082 mi
was having shifting problem for last year had it to two ford dealers one did a fix on the throttle body it didn't make any difference second ford dealer changed the fluid said they couldn't find anything wrong. Same problem took it back to the first Ford dealer told them what I had done they checked it and said the fluid smelled burnt and it had a code 67 which means they said replace the transmission.$4,600 estimate.
Took car to an independent shop they said transmission was over full adjusted the fluid level no change still down shifting very hard they did a transmission rebuild put in a rebuilt torque converter and transmission overhaul kit transmission filter and new fluid and a new motor mount because of the hard shifting. STILL NOT FIXED shifts the same way after car warms up. VERY FRUSTRATED !!!
Visitor, 2006 Mercury Montego, 66,000 mi
Had my trans upgraded, did not help. Then I had the trans fluid replaced, now it has not been a problem.
Visitor, 2005 Mercury Montego, 92,000 mi
delayed shifting from first to second.have not had it diagnosed or repaired.
Visitor, 2006 Mercury Montego, 60,000 mi
Car was jerking very bad, sounded like it was going to break. Took it in and had the trans upgraded and it is better but it does it a few times on an upgrade. Why do they not make a recall and fix the problem?
Visitor, 2006 Mercury Montego
As car changes gear, the transmission seems to "drop" into the next gear. It causes the whole car to shutter