2004 Mercury Mountaineer power train problems
64 owner complaints filed with NHTSA name the power train on the 2004 Mercury Mountaineer — 30% of all complaints for this model year.
What owners report
“This vehicle is has a power train problem from day one with the 5R55S/W transmission and AWD transfer case. I purchased this vehicle where it stranded my family over 200 miles from home and it's a non running car. This vehicle should have been removed from being sold with this defect and crushed! I…”
filed Jun 21, 2021
“Failure of front differential mount carrier bushings failure leading to two transmission rebuilts,transfer case rebuild, and over $5000.00 in repairs. Failure of carrier bushings would lead to front end locking up. Causing a jackhammer affect on the drivetrain of the vehicle. To close calls due to…”
filed Feb 23, 2016
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
Ford: some vehicles may exhibit oil separation from the internal lube found in the unitized cartridge seal. Oil separation appears to be and is often misdiagnosed, as an axle lube leak. *pe
TSB-08-19-3 · Service Bulletin/Repair Instructions · issued May 1, 2009
Power Train problems in other Mountaineer years
| Year | Reports | Share |
|---|---|---|
| 2008 Mountaineer | 9 | 9% |
| 2007 Mountaineer | 25 | 31% |
| 2006 Mountaineer | 39 | 33% |
| 2005 Mountaineer | 19 | 23% |
| 2003 Mountaineer | 42 | 28% |
| 2002 Mountaineer | 144 | 39% |
| 2001 Mountaineer | 1 | 5% |
| 2000 Mountaineer | 15 | 12% |
| 1999 Mountaineer | 8 | 5% |
| 1998 Mountaineer | 9 | 4% |
| 1997 Mountaineer | 8 | 2% |
Other reported problem areas on the 2004 Mercury Mountaineer
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.