gear oil
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Cross-Country
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gear oil
Hello,
I have an '04 exped 4WD eddie bauer with the 5.4L. It just hit 150000 mi, so I am doing some maintenance on it. I am going to change the fluid on the differentials and transfer case. I got some synthetic gear oil for the differentials and synthetic ATF for the transfer case, but looking in my Haynes manual, it says to add 4oz of "friction modifier" to the rear differential when changing the gear oil. Do I really need this? I got synthetic gear oil so I figure its fine, but I just want to be sure I don't damage the rear diff by not adding it. Any insight would be helpful.
Thanks!
Matt
I have an '04 exped 4WD eddie bauer with the 5.4L. It just hit 150000 mi, so I am doing some maintenance on it. I am going to change the fluid on the differentials and transfer case. I got some synthetic gear oil for the differentials and synthetic ATF for the transfer case, but looking in my Haynes manual, it says to add 4oz of "friction modifier" to the rear differential when changing the gear oil. Do I really need this? I got synthetic gear oil so I figure its fine, but I just want to be sure I don't damage the rear diff by not adding it. Any insight would be helpful.
Thanks!
Matt
Fleet Owner
Joined: Apr 2008
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You need it if it's a limited slip differential in the rear. The front is not limited slip.
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Dave85zxt
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Aug 24, 2004 11:35 PM
