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Unread 05-06-2013, 05:55 PM   #1
shaynesaw
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98 ZJ Back diff grinding while turning

When I turn either direction I hear a low pitch grinding sound coming from the back axel area.
It gets worse the sharper I turn. Seems to be a lot worse when accelerating while turning.
I haven't looked to far into it because I just noticed it but any thoughts? possibly no fluid?



Can anyone help in this matter?

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Unread 05-06-2013, 06:37 PM   #2
durango-bob
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Bad wheel bearings would do that. And they go bad in short order when you run low on Diff fluid.
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Unread 05-06-2013, 09:39 PM   #3
shaynesaw
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Quote:
Originally Posted by durango-bob
Bad wheel bearings would do that. And they go bad in short order when you run low on Diff fluid.
Thankyou kindly
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Unread 06-09-2013, 10:40 AM   #4
shaynesaw
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Quote:
Originally Posted by durango-bob
Bad wheel bearings would do that. And they go bad in short order when you run low on Diff fluid.
So I changed the back wheel bearings and inspected the diff condition. Diff looks mint.
I'm still getting a grinding at the rear end when I turn either way. It doesn't seem to do it until I've driven it for a bit and everything in warm.
Any thoughts?
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Unread 06-09-2013, 12:23 PM   #5
shaynesaw
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Part store guy suggested synthetic gear oil and posi-track antislip additive.
Will try that
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Unread 06-09-2013, 02:06 PM   #6
lil_joe
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If you Have the tow pkg, it could be your LSD
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Unread 06-09-2013, 02:14 PM   #7
shaynesaw
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I did have the tow package but removed it.

Is the dana 44 a LSD?
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Unread 06-09-2013, 02:19 PM   #8
Timo_90xj
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Not necessarily. However, since your bearings are good I would also suspect the limited slip clutch packs. They tend to go bad within 100-150k miles, sometimes even less if wrong type of gear oil was used. If they are bad, you need to replace the packs to make the grinding go away. Use spicer replacement parts.

I'd strongly suggest using the Mopar limited slip friction modifier whenever changing gear fluid in the rear. That is, if you have a limited slip rear.
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Unread 06-09-2013, 02:31 PM   #9
shaynesaw
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Can you tell if its LSD by this picture?
image-4002923790.jpg  
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Unread 06-09-2013, 02:58 PM   #10
PolkaPower
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That is a limited slip carrier.
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Unread 06-09-2013, 02:59 PM   #11
shaynesaw
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I appreciate the help
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Unread 06-09-2013, 06:40 PM   #12
dusterdude
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Quote:
Originally Posted by PolkaPower
That is a limited slip carrier.
Polka,im used to seein clutch packs in the lsd carriers,how can one tell that one is lsd
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Unread 06-09-2013, 07:07 PM   #13
PolkaPower
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Quote:
Originally Posted by dusterdude View Post
Polka,im used to seein clutch packs in the lsd carriers,how can one tell that one is lsd
The shape of the carrier. Here is a open and LSD.
picture-12.png  
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Unread 06-09-2013, 07:31 PM   #14
HOSTED67
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Changing the fluid and adding friction modifier is a cheap and easy thing to try first. Drive it for a while and see how it does. The noise could go away after the new fluid and friction modifier work into the clutches.
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Unread 06-09-2013, 07:46 PM   #15
shaynesaw
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Thanks for the picture comparison.

I will change it tomorrow and see what happens
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