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

98,385

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

98,385

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.

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