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Unread 12-17-2013, 03:48 AM   #1
ChippyKK10
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2010 KK Liberty 
 
Join Date: Sep 2012
Location: Alberton, South Africa
Posts: 40
4WD Auto - Knocking

Hi Guys, I have not made much use of the 4wd functions on my Cherokee, but during a very heavy rain storm yesterday, decided to engage 4WD - high (Auto) for added safety on the flooded highway. After a few Km i noticed a light knocking from the front right wheel when i braked. this happened a few times until i disengaged 4WD. then the noise had completely gone. Most of the workshops here are closing now so i wondered if any-one else has had this problem and what the cause was?? I suspect it could be a CV joint in the right front, or something to do with the front drive shaft. Or was it just because there was not enough slip on the front wheels and the T/f box was starting to wind up??? Any Help will be a big help becaus I think I can see quite a few dollars going out of the door here!!

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Unread 12-17-2013, 09:07 AM   #2
huntb
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2008 KK Liberty 
 
Join Date: Aug 2011
Location: Grand Haven, MI
Posts: 576
Quote:
Originally Posted by ChippyKK10 View Post
Hi Guys, I have not made much use of the 4wd functions on my Cherokee, but during a very heavy rain storm yesterday, decided to engage 4WD - high (Auto) for added safety on the flooded highway. After a few Km i noticed a light knocking from the front right wheel when i braked. this happened a few times until i disengaged 4WD. then the noise had completely gone. Most of the workshops here are closing now so i wondered if any-one else has had this problem and what the cause was?? I suspect it could be a CV joint in the right front, or something to do with the front drive shaft. Or was it just because there was not enough slip on the front wheels and the T/f box was starting to wind up??? Any Help will be a big help becaus I think I can see quite a few dollars going out of the door here!!
4WD should only be used in ice, snow, mud and loose gravel. You were probably getting binding issues
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Unread 12-17-2013, 09:55 AM   #3
AtTheHelm
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Join Date: Nov 2012
Location: South Lake Tahoe, CA
Posts: 759
If your shifter says, '4wd auto' and not '4wd lock' then you have the selec trac tcase and your fine driving on all surfaces with 4wd engaged. With the command trac t case (part time 4wd) you cannot drive on traction surfaces with 4wd engaged.

Your symptoms sound like a cv issue.
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Unread 12-18-2013, 03:17 AM   #4
josworth
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2010 KK Liberty 
 
Join Date: Oct 2013
Location: Akron, Ohio (OH)
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@AtTheHelm is correct in the description of the two systems. I too have Selec-Trac and you can engage 4wd on any surface.

@ChippyKK10, how many miles/KM's does your Cherokee have? Do you feel any vibration when driving? At what speed? Just sounds alone can point to many things. What do you feel when you drive it? A clunk or knocking sound under braking can be the CV joint. It can also be something in the suspension like a tie rod end, ball joint, or bushing. Best thing to do right away is put it up in the air and check all the suspension parts. Grab the wheel and tire assembly and check for play forward and back and up and down. If you can move it, you need to look at what suspension part is worn out.
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Unread 12-18-2013, 03:37 AM   #5
ChippyKK10
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2010 KK Liberty 
 
Join Date: Sep 2012
Location: Alberton, South Africa
Posts: 40
Thanks Guys, I do have the selectrac 11 box and the shifter does say "4WD Auto" As I mentioned the "clunking" only came on during braking. The suspension was all checked around 1500km ago as I had new wheels fitted and insisted on all suspension being checked then. So, yes I tend to agree that it seems to be a drive shaft universal (CV) which I will have to have replaced in the new year now. Thanks again!!

By-the-way, I have 104000km on the clock at the moment and the ride is VERY smooth, no vibrations, shakes, noises or anything else. As i mentioned this "clunking" only showed up when the 4WD Auto was engaged and when braking. There are absolutely no sounds grumps or groans when braking in 2WD.
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Unread 02-12-2014, 07:38 AM   #6
ChippyKK10
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2010 KK Liberty 
 
Join Date: Sep 2012
Location: Alberton, South Africa
Posts: 40
Hi Guys, an update on my "clunking" I have consulted all that I thought might know or help, but to no avail. My local dealer was very keen to just about strip every part of my transmission to "Help" find the problem, I told him where to go. I soke to an old friend of mine who checked the jeep over with his diagnostic computer and found nothing. He then proceeded to ask when i last used 4WD low which i had not done for ages - he then started the jeep, put her in nutral, engaged 4WD low, then engaged "D" - there was a substantial "clunk" from the front right, he then drove forward a few meters, engaged reverse, drove back a few meters and said try that. Hey Presto my knocking problem / clunking was GONE.... He said it could have been the front right hub that had not disengaged properly since it was last used and was knocking while in 4WD "Auto", anyway problem solved for any of you who may develop the same problem or who know someone who has it!! here is the FIX.
jeep-bonnet.1.jpg

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Unread 02-12-2014, 08:21 AM   #7
tommudd
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Problem with that is the "hubs " do not engage or disengage. Older vehicles with locking hubs then yes that could possibly happen.
Everything in the front diff turns all of the time. Just when you put in 4 hi or 4 lo it locks the front and rear together.
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Unread 02-13-2014, 02:41 AM   #8
ChippyKK10
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2010 KK Liberty 
 
Join Date: Sep 2012
Location: Alberton, South Africa
Posts: 40
Thanks for the info tommud.. I am not sure exactly what happened during the excercise, all I know is that it worked. i have tried using the 4WD Auto on a few occasions since "the fix' and have not had the knocking occur again. All runs smooth and quiet in all drives.
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Unread 02-13-2014, 08:28 AM   #9
Poncherello
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Location: Paterson, New Jersey
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Quote:
Originally Posted by ChippyKK10
Thanks for the info tommud.. I am not sure exactly what happened during the excercise, all I know is that it worked. i have tried using the 4WD Auto on a few occasions since "the fix' and have not had the knocking occur again. All runs smooth and quiet in all drives.
Awesome glad everything worked out
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