Knocking noise in front differential? -
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Unread 02-28-2011, 02:14 PM   #1
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2000 XJ Cherokee 
Join Date: Jun 2008
Location: Virginia
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Knocking noise in front differential?

The last few weeks I have noticed that at very low speeds (x < 10 mph) I have heard and felt knocking in my 2000 4.0. By the way the vibrations come through the gas pedal and the steering wheel, it feels like it might be the front differential spinning up (or something other to do with the front differential?). I got the underside hung up a few weeks ago and actually crashed down on it fairly hard (that darn curb drop-off is going to pay ) 4x4 still works fine and I have noticed no problems other than the vibrations. I've read people have figured similar problems to be the exhaust even? It was at least somewhat affected by my little accident as well.

Does anyone have any experience with something like this? I'm still very new to the forum and may not have described this very well, but if anyone has any advice that'd be great.

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Unread 02-28-2011, 02:45 PM   #2
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I would pull the cover and inspect the gears first.
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Unread 02-28-2011, 02:48 PM   #3
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Location: out in the garage - Minneapolis, Minnesota
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Then inspect the u-joints and check torque and the bushings on the track bar and control arm bolts.

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Unread 02-28-2011, 02:53 PM   #4
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1998 XJ Cherokee 
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I had a weird knocking in my rear diff. Turns out 4 teeth had broken off the ring gear. I drove over a bit more than a curb though...

Have you looked at anything in the front axle yet? Check everything that moves when you drive, especially u-joints in the axle and driveshaft.
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4x4 , differential , steering , vibrations

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