05 Mountineer rear end issues.

Asked by Sep 28, 2016 at 11:55 AM about the 2005 Mercury Mountaineer 4 Dr STD AWD SUV

Question type: Maintenance & Repair

I have a 05 Mercury Mountineer AWD V6. I have had both rear bearings
replaced that are only 9 months old. In the past 4 months I have noticed the
hum in the rear end starting again. To then when I would be taking a right turn
from a stop it will skip. Now within the past week it has started to sound like
something is slamming like my transmission was slipping but it's coming from
the back. I think its my differential and wondering if worth paying to have it
looked at when I have a feeling it's that and will just put my money to
something new and junk it.

3 Answers


That sounds like the limited slip clutches maybe going out or there wasn't enough limited slip addictive put back in when the bearings were done. Unfortunately the only way to really tell is too open it up and check it all out. You may not have to replace the rear differential but just overhaul the one you have.

You just made me more confused lol. Could this be damage done from crappy work with the bearings? And not my differential at all? Or because my brain is fried from stressing and reading to much about this... Maybe could you explain in Laymans terms lol


Ok these rigs have limited slip rear differentials, when any work is performed they need special limited slip differential lube put back in, so if there wasn't limited slip lube put back in, or the ratio to slipped slip additive was wrong it can cause the clutches in the limited slip unit in the rear end to chatter or slip when they should not be, this can wear out the clutches in very short time and then requiring differential work. Now you could try draining the rear differential and then adding the additive and topping it off with standard lube and see if that cures the problem, or take it in and have it turn down to see if it needed new clutches. Check your receipt for the work done and see if they did indeed put limited slip in the differential when the bearings were replaced.

Your Answer


Looking for a Used Mountaineer in your area?

CarGurus has 771 nationwide Mountaineer listings starting at $1,500.


Mercury Mountaineer Experts

  • #1
    Tom Demyan
  • #2
  • #3
View All

Related Models For Sale

Used Ford Explorer
848 Great Deals out of 64,280 listings starting at $1,200
Used Mercury Mariner
16 Great Deals out of 901 listings starting at $1,250
Used Ford Expedition
428 Great Deals out of 19,938 listings starting at $2,500
Used Chevrolet Tahoe
642 Great Deals out of 37,663 listings starting at $795
Used Jeep Grand Cherokee
787 Great Deals out of 73,008 listings starting at $999
Used Lincoln Navigator
101 Great Deals out of 3,499 listings starting at $1,999
Used Ford F-150
2,488 Great Deals out of 220,740 listings starting at $1,222
Used Dodge Durango
210 Great Deals out of 24,278 listings starting at $1,500
Used Ford Escape
929 Great Deals out of 105,215 listings starting at $550
Used Nissan Pathfinder
304 Great Deals out of 21,963 listings starting at $1,495
Used Lincoln Aviator
167 listings starting at $2,400
Used Cadillac Escalade
256 Great Deals out of 11,859 listings starting at $2,995
Used Honda Pilot
433 Great Deals out of 38,674 listings starting at $999
Used GMC Yukon
369 Great Deals out of 18,592 listings starting at $1,800

Used Cars For Sale

2010 Mercury Mountaineer For Sale
50 listings starting at $5,995
2009 Mercury Mountaineer For Sale
17 listings starting at $6,995
2008 Mercury Mountaineer For Sale
97 listings starting at $1,500
2007 Mercury Mountaineer For Sale
4 Great Deals out of 116 listings starting at $4,206
2006 Mercury Mountaineer For Sale
108 listings starting at $2,100

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.