Noise underneath car

VPasculli

Member
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Hello,
I have a 2005 Lincoln Aviator and yesterday while driving the rear tire differential kicked in and a weird rumble noise was heard for a few seconds then stopped while accelerating. It didn't happen again until the rear differential kicked in again (uneven pavement) and the same noise was hear for a few seconds then disappeared. Any ideas?
Thanks
 

Slick Fan

Senior Member
601
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0
Utah
Since the Aviator is either rear wheel drive, or all wheel drive...anytime it's moving under it's own power, the rear diff is always "kicked in". Just a fun fact. LOL :D

Anyway, it sounds like you might have an intermittent bearing noise. I would look for any play in the rear wheel bearings, rear CV joints, and driveline U-joints. I would also drain & refill the diff oil, to examine the old oil for metal particles. If there's a lot of metal in there, the issue could be in the differential itself.
 

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