Differential Lube
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Freshman User
Joined: Jul 2005
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Differential Lube
I know this has been debated before, but what is the consenses of opinion about the best synthetic gear oil for the front and back diffs. I have an 04 FX4 with the 3:55 gears. And for that matter, what is the best lube for the transfer case.
Cargo Master
Joined: Aug 2004
Posts: 2,899
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From: Lynnwood, WA
If you don't expect to change it for a long time, by all means, use synthetic. But if you change it frequently (i.e. because of submerged axles), use something cheaper that meets the spec. Last time I changed (almost 2 years ago) Amsoil was at least a buck cheaper than the other brand (I believe it was Mobil 1) in the store I got my oil, so I used Amsoil 75W140. Other than price, I don't think there is a whole lot difference between various 75W140's.
Last edited by aurgathor; Mar 13, 2006 at 02:32 PM.
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
Don't forget a few ounces of friction modifier in the rear diff if it's a LS.
Your transfer case calls for Mercon-rated ATF, so something like Mobil 1 ATF will work if you wanted to go with a full synthetic in there.
Your transfer case calls for Mercon-rated ATF, so something like Mobil 1 ATF will work if you wanted to go with a full synthetic in there.
