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Unread 11-03-2009, 10:21 AM   #1
wetzelgw
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1994 ZJ 
 
Join Date: Sep 2009
Location: ohio
Posts: 6
Strange groaning/creaking noise when turning 94 GC

Hi everyone,

I bought a '94 Grand Cherokee Limited about a month and a half ago, and I'm still getting accustomed to it...trying to figure out what's normal and what isn't. One of the things I'm noticing is almost like a groaning/creaking noise coming from the back when I turn. It doesn't do it all the time- usually I only hear it when pulling in or out of parking places at low speed. Is this normal? I've tried searching this forum, but most of what I've found deals with clicking noises or groaning from the front end, which isn't what I'm hearing. Any ideas on what it likely is/how to fix it?

Thanks

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Unread 11-03-2009, 11:23 AM   #2
gunner454
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1993 ZJ 
 
Join Date: May 2009
Location: california
Posts: 13
Perhaps the PO changed the diff fluid and didn't add the LS additive. I had the same issue and as it turns out LS specific gear lube does not necessarily have the additive it needs. I made that mistake and once i put the additive in, the noise went away. Not really confident on the inner workins of an LS diff but what i've been told is that with out the additive the clutch packs will rub and chatter and make all sorts of weird noises. And it only happened a low speed making tight turns (i.e. parking lots)
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Unread 11-03-2009, 01:43 PM   #3
wetzelgw
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1994 ZJ 
 
Join Date: Sep 2009
Location: ohio
Posts: 6
That is interesting. I would have assumed LS specific gear lube would have the additive it needs. I bought the car with impression that the PO was not a hands on type, so I'm guessing he did not change it. However, he said the GC had been sitting for about six months, so it is possible the fluid is low. I will check the diff fluid when I get a chance. If that is the case, can I get the correct diff fluid at a standard parts shop (i.e. Autozone), or would I need to go to a Jeep dealer? Thanks for the suggestion.
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Unread 11-03-2009, 01:51 PM   #4
Travis873o
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your zj's have limited slip?

thought only the wj's and the 5.9s had limited slip
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Unread 11-03-2009, 02:30 PM   #5
wetzelgw
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1994 ZJ 
 
Join Date: Sep 2009
Location: ohio
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Well I just checked the specs, and no, apparently they do not. I was just going off what gunner posted. Could the diff fluid still be causing my groaning?
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Unread 11-05-2009, 11:01 AM   #6
gunner454
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1993 ZJ 
 
Join Date: May 2009
Location: california
Posts: 13
Quote:
Originally Posted by Travis873o View Post
your zj's have limited slip?

thought only the wj's and the 5.9s had limited slip
You are correct, but as stated in the FSM... "Lubricant for Model 35 axle with Trailer Tow and Trac-Lok: SAE 75W-140 SYNTHETIC gear lubricant with friction modifier."

Which, when i looked through the local stores the only gear lubes that had those specs were the LS specifc lubes. So that was my mistake. I just re-read my post and realized that i said it was LS additive, not friction modifier. I had just been talking with my buddy about his LS axle and was still in that mode of think.

But, as to the OP, when i brought it in to the shop thinking it was a more serious problem they popped the diff cover off and let the fluid drain out and could tell there was no friction modifier in it. They replaced the fluid and put in the friction modifier, no more groaning/vibration. That was my issue, hopefully thats yours too cause its a cheap fix.
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