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I have an '07 Limited with a Hemi and I've rarely ever shifted it into 4WD low. A friend of mine told me to shift into 4 low every now and then to lube the gears. So I went off on a dirt path and shifted into 4 low, drove for about 100 ft then shifted out and drove off. Now my commander makes a strange clunk directly under the driver seat when I start, stop and turn to the right. I went off road again shifted into 4 low for a bit then back out into 4 high and now the clunk is gone. Is this something I should be worried about? Did the gears just not line up correctly when I shifted it out the first time?
 

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Sounds to me like something did not fully engage or disengage when you shifted
into 4low the first time. Not too unusual, I am sure smarter people than I will have
something of value to add to this.
 

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I would suspect cico7 is right and it proved what your friend was warning about. You don't exercise the system, then things stick together or seize up.

If everything seems fine now, I'd just chalk it up to NOT exercising the system enough and it didn't engage/disengage fully or properly because it was sticking or lacking some lube, it did it properly on the 2nd try because of the little exercise it got was enough to free it up.

And keep engaging the 4LOW everyone once and a while to keep it exercised.

Yes, it is very true, lack of use can cause problems, although NOT as many as abusive use or high usage hours, but it does.
 

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P.S. For this purpose, you can kick it into 4-LO on any surface. Just drive in a straight line for a bit.
Just so the O.P. understands, going into 4LOW locks the center differential, if you drive a perfectly straight line all the wheels will spin the same speed and it doesn't matter the differential is locked.

BUT, the moment you turn the wheel in the slightest (well a little more than slight) the wheels will spin at different speeds and the locked center diff won't let it, so the tires have to slip and slide on the surface and on dry concrete/asphalt, that will cause all sorts of bad stress on the drivetrain and tires, could even break something.

Oh, BTW, it occurred to me that its possible you might NOT have engaged/disengaged 4LOW properly, since you don't do it that often. Might be worth reviewing the procedure and conditions you need in the O.M., it might have been a case you weren't moving or moving to fast that caused the problem the first time and it got it right on the 2nd try?
 
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