Mechanics

MERCURY MOUNTAINEER DRIVESHAFT PROBLEM

1999 Mercury Mountaineer • 140,000 miles

My mountaineer has a vibration under the pedal through the floorboards, it only happens once I hit about 58 mph. It gets louder the faster I go, until I get to about 65 mph. Then it quits down a little but does'nt go away until I slow back under 58 mph. I checked and filled the gear lube in the front diff. It was low because I have a slow leak through th rear seal. Does'nt leak bad just about half pint in over a couple years. My driveshaft looks straight and can't see any wieghts missing. And now about one week after it started there is a slight clunk like a cracking kind of noise and you can feel it as you drive. Does anyone have any ideas?
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Guest
October 30, 2012.



Have your rear driveshaft ujoints checked, they may be worn and that is where vibration for that type of thing is.

Hmac300
Oct 30, 2012.