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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van

Transfer Case/Diff Oils

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Old Jul 11, 2010 | 12:03 PM
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-=Pit=-'s Avatar
-=Pit=-
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Transfer Case/Diff Oils

Well I spent the morning reading the Tech Folder link thread by thread. I should have read them much sooner then now. Awesome info so thanks to all who put into them for nubs like me! I do have a question though in regards to Diff and Transfer case oils a few questions.

What is the best fluid for the Transfer Case? Royal Purple, Red Line, ??????

As for the rear diff the same question with regards to fluid.

What is the best fluid for the Rear Diff? Royal Purple, Red Line, Mobil 1??
Also please include if you had to add Friction Modifier or not with your recommendation. Or is that something you should get regardless.

I am at 69K on my truck with this up on the board to do and it will be my very first time. The transfer case looks like cake I am hoping the diff is too .

Pit
 
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Old Jul 11, 2010 | 12:33 PM
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Headviking's Avatar
Headviking
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From: Oakville, Ontario
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Royal Purple.

Rear Diff. = 75w-140
Front Axle/Transfer case = 75w-90 or synchromax
 

Last edited by Headviking; May 17, 2011 at 09:44 PM. Reason: mistake
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