Problems With Early Production 5-speed Automatic Transmission on Mercury Mountaineer

Various problems with the 5-speed automatic transmission were common. These problems can be more common on the 2002 models with build dates before March, 2002. There are many service bulletins describing the diagnoses and repairs, which include fluid leak repairs, transmission software updates, or internal failures requiring a costly repair.

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Average mileage: 120,492 (70,000–164,000)
Drive Trains affected: 2WD, 4WD
3 model years affected: 2002, 2004, 2008
16 people reported this problem
9 people shared problem details
2002 Mercury Mountaineer- 4WD70,000
Transmission started down-shifting at speed. New transmission and bore and servo work : $3400
2004 Mercury Mountaineer- 2WD130,000
Mi trasmision no da rebersa pero los demás cambios funcionan bien. El mecánico dise que son los selenoides camviaro el asiste y no se veían rebabas.pude ser eso o es megor cambiar toda la trasmisión
had to get the transmission rebuilt because the O/D light came up and the transmission started skipping and didn't allow you to go fast. it cost $1000 to get it fix.
2008 Mercury Mountaineer- 4WD87,000
Transmission failed requiring total rebuild.
2002 Mercury Mountaineer- 4WD110,000
would not change gears needed new transmission
2002 Mercury Mountaineer- 4WD120,000
Per Transmission shop needs new transfer case & possibly may need entire transmission rebuilt. GREAT!
2002 Mercury Mountaineer- 2WD120,000
Had to replace servo bores in tranny along with major overhaul. $2600!
2002 Mercury Mountaineer- 4WD102,900
check transmissin message. Incorrect gear ratio 5th gear reliable tranny shop $2,100 mercury $3600. Light only came on once.might look for new car
OD off flahes in msg center, and check engine indicator comes on. Waldorf Ford recommends trans replacement @ $3700.00
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