1997 Mercury Mountaineer

Hi:
Have the u-joints checked. If you only hear this when in 4wd, have the front CV joints checked also. The squeak you hear is most likely from dried out rubber bushings. They could be sway bar bushings, control arm bushings. Take a can of WD40 and spray one thing at a time until the sound goes away. That way you'll know where the noise is coming from.

Joe