1997-2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

Rear diff

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Old 06-02-2012, 06:16 PM
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Rear diff

I have a 99 expedition and when I turn I have some shutter from the rear diff could someone tell what is Cuasing it
 
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Old 06-02-2012, 06:33 PM
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4x4? Or 4x2
 
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Old 06-02-2012, 06:35 PM
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Originally Posted by Muddinexpedition
I have a 99 expedition and when I turn I have some shutter from the rear diff could someone tell what is Cuasing it
And yes it is 4x4
 
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Old 06-02-2012, 06:43 PM
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Yes it Is 4x4
 
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Old 06-02-2012, 11:59 PM
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Do you have the limited slip rear end? If so have you changed the fluid lately?
 
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Old 06-03-2012, 12:07 AM
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Originally Posted by alwaysfords41
Do you have the limited slip rear end? If so have you changed the fluid lately?
No I will do that thanks for the advice
 
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Old 06-03-2012, 12:44 AM
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but what im trying to thin git might be the transfer case because when it turns but is it an AWD?
 
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Old 06-03-2012, 08:52 AM
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It has a4wd on the selector
 
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Old 06-03-2012, 10:22 PM
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Drain the rear differential and replace the fluid along with the appropriate friction modifier - but only if it's a limited slip rear end.

If it's a standard rear end, you can try and replace the fluid and see if it helps.

Both ways, it's a somewhat costly experiment (+/- $100) to see if it works.


For the record, I have the limited slip rear end and replacing the fluid along with adding the friction modifier only somewhat helped me. I think a more effective option would be to replace with an aftermarket limited slip unit from Eaton.
 
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Old 06-03-2012, 10:25 PM
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How do I tell if I have a limited slip or standard diff
 
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Old 06-04-2012, 05:47 AM
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Originally Posted by 97ExpGuy
Drain the rear differential and replace the fluid along with the appropriate friction modifier - but only if it's a limited slip rear end.

If it's a standard rear end, you can try and replace the fluid and see if it helps.

Both ways, it's a somewhat costly experiment (+/- $100) to see if it works.


For the record, I have the limited slip rear end and replacing the fluid along with adding the friction modifier only somewhat helped me. I think a more effective option would be to replace with an aftermarket limited slip unit from Eaton.
You should try doubling up on the modifier.
 
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Old 06-04-2012, 06:01 PM
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Originally Posted by Muddinexpedition
How do I tell if I have a limited slip or standard diff
Get your axle code off the door sticker, and then google "ford axle codes" or similar and it will tell you what it is. Someone here may have the decoder handy so you could also just post it.
 
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