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Unread 04-26-2010, 07:46 AM   #1
prushinfox
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Strange sounds front end in 4WD

This is for a 2000 Cherokee XJ.

When in 2WD and driving at any speed or turning, or in reverse, the drive train is quiet and smooth.

When in 4WD and driving at any speed, straight..or in reverse straight, the drive train is quiet and smooth.

When in 4WD and turning right of left on any surface, at normal 4WD operating speeds there is a strange sound like crunching, sometimes metallic. There is no play in the drive train nor slack in the steering linkages or box.

I am beginning to fear that the front diff. is hosed up. But I would think I would hear the sound all the time since it does turn (free wheel) in 2WD. Why wouldn't this occur when driving in a straight line?

I wanted to get your opinions before I embark on a tear down.

Thanks!

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Unread 04-26-2010, 08:39 AM   #2
Prosonic
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My first guess was going to be front u-joints, but you say there is no play in the drivetrain.

My next guess, would be spider gears, because of it only happening when turning. However, like you said, you would think they would act up even in 2WD.

I think you're going to have to open up the diff and see what's going on.
While your at it, check those u-joints one more time, you never know.
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Unread 04-26-2010, 08:54 AM   #3
trouttrooper
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front axle U-joints are shot. replace immediately
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Unread 04-26-2010, 09:04 AM   #4
lowicz96
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If the ujoints are shot you will hear the noise when turning in 2wd as well but it would be as loud as in 4wd
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Unread 04-26-2010, 10:14 AM   #5
Timo_90xj
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I'm gonna say u-joints. You might not feel anything wrong with them by hand, but after you replace they are quiet. I've seen u-joints so tightly stuck you could not turn then by hand when you removed the axle shafts. But believe me, they make a horrible noise while driving

Spider gears are another possibility, but I'd start with u-joints...
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Unread 04-27-2010, 06:50 AM   #6
prushinfox
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Ok folks, I'll check those U Joints thoroughly and then if there's nothing there, then I'll pop the front diff. After I finish building my deck
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Unread 04-27-2010, 07:06 AM   #7
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This may be a silly question... but are you trying 4wd on dry pavement?
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Unread 04-27-2010, 11:20 AM   #8
Timo_90xj
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Even if he tries part time 4wd on dry pavement, it shouldn't make any "horrible" noises when turning if everything is fine. Nothing wrong in trying part time 4wd on dry pavement. It's the long-time use on dry pavement and higher speeds that will kill the drivetrain.
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***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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