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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 129,321 (70,000–189,996)
Drive Trains affected: 2WD, 4WD
7 model years affected: 1998, 2002, 2003, 2004, more2005, 2006, 2008
37 people reported this problem
Viewing 1 - 18 of 18 comments
Transmission started slipping the RPMs raises higher than the truck is going then eventually it will catch up
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.
Mine is actually the AWD model. We performed that fix here:

The transmission has successfully managed another 30,000 miles but now it's done. P0745 and P0775. O/D light blinks and the truck slips in between 2/3rd. I didn't know it years ago, but apparently part of my bad gas mileage had to do with the fact that I'd lost 5th gear a long while ago.
Transmission gave out this morning with no warning really, lost reverse and couldn't drive over 30mph. I'm looking at a costly repair from transmission shop, not sure what yet but I'm kind of dissapointed that Ford wouldn't take responsibility for this issue seeing it's obviously manufactured issue, it's way to common to not be something that happened during the assembly of vehicles. That's a lot of money to come out of the average persons pocket and its not even I'm the 100,000 mile range, I'm so dissapointed and regret buying this.
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
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
Per Transmission shop needs new transfer case & possibly may need entire transmission rebuilt. GREAT!