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I have a 91 4 runner that just started making a (hard to describe) periodic buzz/whine sound coming from the right front driveshaft/axle area mostly when 4x4 is disengaged

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Neal, it may not be the right front axle. I thought I had the same problem with 97 4Runner but it turned out to be the right rear axle bearing. Even the technican thought the niose was coming from the right front axle when he test drove it with me. Seems those rear bearings go out if you do a lot of towing with the truck. Cost about $ 400.00 to replace make sure they replace the ABS sensor collar and replace the axle breather tube vent ( they get plugged and when they replace the bearing , they have to replace the seal in the axle also and mine leaked after because of a plugged axle vent.

Posted on Dec 20, 2008

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