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I have a 2006 4runner and it has a rather loud whine coming from the rear end, is it the wheel bearings or does the diff need work ie bearings?

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My 2002 Sequoia had that ***** whine too.
It ended up being rear wheel bearings.

Not to rule out ring and pinion gears in the rear end, I hope it ends up just being the bearings for you.

Posted on Dec 29, 2016

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if the noise is occurring on acceleration it will be the rear pinion bearing
if it is on deceleration it will be the front pinion bearing
if it comes and goes s you drive normally it is the incorrect mesh between the crown wheel and pinion and indicates worn carrier side bearings allowing the mesh of the crown wheel and pinion to vary
check for correct oil in the diff and check magnet on drain plug for metal bits

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That may be possible. Clean out the area and check again so you would see better where exactly the leak comes from. Of the sound is loud or similar to metal, that may be it or a bearing assembly may be going out.

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I sound more like there is something wrong in the wheels.I would check your bearings...

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