Front axle
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Tuned
Joined: Jun 2006
Posts: 338
Likes: 0
From: Boulder City, Nevada
Front axle
Quick question. I have a 2004 4X4 Super Duty 6.0
(I am changing fluids but can't remember what fluid to use in front axle and transfer case. Rarely use four wheel drive but have not change front axle or transfer case in a while.
(I am changing fluids but can't remember what fluid to use in front axle and transfer case. Rarely use four wheel drive but have not change front axle or transfer case in a while.
Laughing Gas
Joined: Oct 2014
Posts: 962
Likes: 114
From: Middle TN
80W-90 (or 75W-90) in the front case, and per Ford, OK to use Mercon LV in the transfer case, even in your year. Do yourself a favor, order a gasket from LubeLocker for your diff, no silicone to use, no waiting, and no leaks. Added benefit, it's reusable for under $30....
Laughing Gas
Joined: Jun 2021
Posts: 983
Likes: 366
Valvoline sells a synthetic transfer case fluid that says its intended to replace the old Ford XL-12 (which Ford no longer makes) that was the original transfer case fill. I use it all my Ford transfer cases, works fine.
Logistics Pro
Joined: May 2017
Posts: 3,523
Likes: 483
From: Southern OH
Mercon ATF was the original fill, Ford XL12 didn't exist back in 04.
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Laughing Gas
Joined: Jun 2021
Posts: 983
Likes: 366
I guess ford switched to recommending XL-12 in 1997-2007 at some point later then. The below is copy/pasted from torque King (formally known as Quad 4x4), they're usually pretty on top of their stuff. Looks to me like when Ford switched to mercon V they just kept making regular mercon and relabeled it XL-12.
*****For the 1997-2007 Model Years, most Ford Factory Shop Manuals list Mercon as the recommended transfer case fluid. Ford introduced Mercon ATF in 1987 and Mercon is the recommended fluid for most 1997 to 2007 4x4 Ford transfer cases. Mercon was superseded by Mercon V which is NOT recommended for use in transfer cases so Ford was recommending XL-12 for use in 1997-2007 transfer cases which has been replaced by Mercon LV. As of May 2019, an old Motorcraft web page still lists Mercon LV as Not For Use in Transfer Cases, but the most recent LV page specifically states LV is now for all transfer cases.
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*****For the 1997-2007 Model Years, most Ford Factory Shop Manuals list Mercon as the recommended transfer case fluid. Ford introduced Mercon ATF in 1987 and Mercon is the recommended fluid for most 1997 to 2007 4x4 Ford transfer cases. Mercon was superseded by Mercon V which is NOT recommended for use in transfer cases so Ford was recommending XL-12 for use in 1997-2007 transfer cases which has been replaced by Mercon LV. As of May 2019, an old Motorcraft web page still lists Mercon LV as Not For Use in Transfer Cases, but the most recent LV page specifically states LV is now for all transfer cases.
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