4wd vehicles may develop a squealing noise coming from the front wheels when driving below 30 mph. This is generally caused by dry excluder seals, lubricating the seals will commonly correct this concern.
Car Problem Reports
Mercury Mountaineer Dry Excluder Seals May Cause Squealing in Front Wheels Under 30 MPH
Mercury Mountaineer Problem
Average Mileage: 140,250 mi (83,000 mi - 218,000 mi)
I noticed squealing in my passenger front when I was driving slow. Ford replaced a dry excluder deal under warranty.
Visitor, 1997 Mercury Mountaineer, 83,000 mi
the frontend starts squeling while driving
Visitor, 1998 Mercury Mountaineer, 218,000 mi
It has been making this noise since it had 170,000 on it. No one can seem to identify the problem