Rear end hum
Junior User
Joined: Nov 2005
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If it is the rear, could be pinion or carrier bearings, possible low on oil. could also be outer axle bearings, tires? usually when going through a turn it is a outer axle bearing. Just had my explorer start making a bad hum but it was at almost all speeds and it didnt change on turns----it turned out to be a bad pinion bearing. Check your oil for small metal particles--thats what the explorer had. If you have any of the diff bearings replaced it would be good to replace them all. Also check your u joints.
Last edited by fire105; Dec 11, 2006 at 05:02 PM.
Cargo Master
Joined: Aug 2002
Posts: 2,013
Likes: 6
From: Cajun Country
Originally Posted by fire105
If it is the rear, could be pinion or carrier bearings, possible low on oil. could also be outer axle bearings, tires? usually when going through a turn it is a outer axle bearing. Just had my explorer start making a bad hum but it was at almost all speeds and it didnt change on turns----it turned out to be a bad pinion bearing. Check your oil for small metal particles--thats what the explorer had. If you have any of the diff bearings replaced it would be good to replace them all. Also check your u joints.
Hotshot
Joined: Jul 2005
Posts: 11,931
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if it dont happen going in a straight line down the road a t 60 MPH it normally is not the bearings, they whine all the time NORMALLY. if it only happens when you turn, that is normally related to the LS unit. it could have some internal wear, or might just need more friction modifier. i would drain and refill with 75w140 synthetic gear lube and add a tube of the friction modifier and see what happens. Auto Zone sells a 7 oz tube of the friction modifier for $6. put it all in.
Junior User
Joined: Nov 2005
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I narrowed the area of the noise to the diff.----I found the metal shavings in the oil---there was a service buletine out on bad explorer pinion bearings. I brought it to the shop and they removed and took apart the diff. and they found the bad bearings, the pinion and carrier bearings were all going bad---probably the shavings from one ruined the others. It cost around $780 for bearing replacement and R+R (complete job). Narrowing down where the noise is coming from is most important and if there is metal in the oil that is the final give-away.--------------------------A LIMITED SLIP that is going bad will chatter going around a turn (left or right). A hum going around a turn is usually a outer axle bearing---if it hums when you are turning right than the left bearing is probably going bad. (the one with the load on it).
Last edited by fire105; Dec 11, 2006 at 08:57 PM.
Junior User
Joined: Nov 2005
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If there is fine metal bits in the oil there would be no sense going any farther, it would be time for the rebuild. Did You rule out outer axle bearing?
Last edited by fire105; Dec 12, 2006 at 01:28 PM.
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Junior User
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If there is fine metal bits in the oil there would be no sense going any farther, it would be time for the rebuild or replace. Did You rule out outer axle bearing?
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Laughing Gas
Joined: Oct 2003
Posts: 967
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From: DC
I haven't ruled out the outer bearing. In fact, my gut tells me that's the problem. Gotta do the easy stuff first. Step 1: Post on FTE, make sure you're not just throwing parts at the problem.
If the fluid level is good, I'll pop the cover. If everything looks good there, it's probably bearing time. What are the odds of a U-joint causing this?
If the fluid level is good, I'll pop the cover. If everything looks good there, it's probably bearing time. What are the odds of a U-joint causing this?
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