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Old 06-26-2013, 06:00 PM   #1
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Unhappy Loud slapping/clicking noise while in 4WD only

Ok everyone I just started with this website and have gotten some really good advice from here, as I like to fix most things myself before I need it to be looked at by a professional.

So heres the problem as best as I can describe it, driving normally in 2WD everything is just fine no problems. Its when I engage to 4WD (hi or lo) I hear a loud slapping/clicking noise from under the jeep and the drive is kinda "studdery" but makes loud slapping noise that sounds terrible. I have been searching on here awhile now, cuz I haven't had to use 4WD yet, and all I found was issues with the t-case. I have a list of ideas to try and check from others responses. But im looking for more help or ideas to try and troubleshoot the problem.

I don't want to have to take it to a garage! Much appreciated!

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Old 06-26-2013, 06:18 PM   #2
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The transfer case is chain driven, sounds like slack in the chain... Dont know if there is a tensioner inside or what, but have seen exploded views of them and the dont look too complicated. I am sure more will chime in.

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Old 06-27-2013, 12:51 AM   #3
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What kind of surface are you engaging 4WD on????? Solid surfaces will cause LOTS of noises to be made because of "windup" front and rear wheels need to be able to "slip" with reference to one another.

Also...... are your tires the same size on both front and rear???? This can cause similar issues EVEN if on loose surface.

Last, but not least, are your front and rear differentials geared the same??? Sounds silly BUT it happens....
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Old 06-27-2013, 10:48 AM   #4
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Bc3_jeep:: Yeah both tires are the same size and the diffs are factory geared never toyed with. As for the four wheel drive it was out in a grassy/muddy field is when I first heard it. Then on solid ground only for a few inches so my friend, who knows a bit about four wheel drive, could hear how the noise sounded. He mentioned something about the t-case but wasnt too sure.
I have been looking into the t-case chain but haven't actually got a chance to inspect it yet, wanted to get some ideas first.
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Old 06-27-2013, 11:04 AM   #5
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Mine used to do this when my transmission mount was shot. I replaced the trans mount and the slapping/clicking stopped. Not saying yours has the same issue but you should check to make sure your trans mount is still holding up.
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Old 06-27-2013, 12:11 PM   #6
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I'll add that to the checkpoint list of things to go over. Thanks for the idea
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Old 06-27-2013, 01:30 PM   #7
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Could be the differential. It could use a fluid change. Worth checking out.
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Old 06-27-2013, 03:12 PM   #8
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The Rear diff or front or just change both?
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Old 06-27-2013, 03:16 PM   #9
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Quote:
Originally Posted by jmgrab1087 View Post
The Rear diff or front or just change both?
For the regear? Both! other wise you wont be able to use your 4wd. One diff would be turning at 3.73:1 (or what ever your OEM gears are) and the other would be turning at 4.56:1 So your transfer case would bind up. If your talking about the gear tag it is on the rear.

Look at it this way. If you have 3.73 gears and 33's @60mph your rear drive shaft will be turning at 2279rpm. If you have 4.56 gears 33's 60mph your drive shaft is now turning at 2786rpm. So if only regeared one diff, one drive shaft would be spinning faster then the other.

I got that info from Tom Woods drive shaft.
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Old 06-27-2013, 07:50 PM   #10
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thanks for the tip i plan on changing out the fluid in both of them

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