A whining from the front while driving may be caused by the front axle shafts. This would be felt between 20 and 45 MPH, and the half shafts can be replaced with revised dampened axles.Google+
Car Problem Reports
Mercury Mariner Whining From Front While Driving – 20-45 mph
Mercury Mariner Problem
Drive Trains Affected: 2WD, 4WD
Visitor, 2006 Mercury Mariner, 2WD
I have this problem currently and I'm searching the internet for possible problems. I will make an appointment with my mechanic today.
Visitor, 2005 Mercury Mariner, 4WD, 60,000 mi
I experience an intermittent high pitched noise while driving. Various speeds, various conditions, same noise. Sounds like an electrical humming, but worse...