Trans/Diff fluid change
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Laughing Gas
Joined: May 2006
Posts: 1,192
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From: Oakville, Ontario
Trans/Diff fluid change
My brother-in-law has a 2009 F350 6.4L 4X4 automatic with LS. we plan on replacing both front and rear diff fluid. Just checking. Manual says they take 75w-140 for the rear (6.9 pints) and Motorcraft Transfer case fluid (2 quarts). What is everyone using instead? For my 2007 I used RP Mercon V I think for the front and RP 75w-140 for the rear with modifier. Any suggestion....
