Two problems related to driveshaft have been reported for the 2004 Mercury Mountaineer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mercury Mountaineer based on all problems reported for the 2004 Mountaineer.
While driving there was a very loud noise from the front of the vehicle. Consumer pulled off the road, and called road side assistant. Vehicle was towed to the dealer, who performed an oil change because of mileage at the time of the incident. Noise recurred the following day. Vehicle was taken back to the dealership, who indicated that the driveshaft was defective, and needed to be replaced. Vehicle is currently at the dealership being inspected.
I purchased my 2004 Mercury Mountaineer in oct 2003. The vehicle was making a roaring noise, once taken in Ford replaced the rear differential and rear drive shaft, also complained of rough shifting of transmission around 30-35 mph changing from 2nd to 3rd gear. The solenoid was replaced, additive added, many reprograms but after 6 trips to dealer still is not corrected. 18 months later roaring noise appeared again and same rear drive shaft was replaced. The vehicle has less than 30,000 miles.