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Message: <blockquote data-quote="Ruger" data-source="post: 644355" data-attributes="member: 1594">The 2014 Raptor Supplement (available here:  <a href="http://owner.ford.com/servlet/ContentServer?pagename=Owner/Page/OwnerGuidePage&year=2014&make=Ford&model=F-150" target="_blank">2014 Ford F-150 Owner</a>) specifies 75W-85 premium synthetic gear oil and does not mention a friction modifier.In complete contrast, the F150 Owner's Manual and the Raptor Supplement for my 2011 both specify 75W-140 synthetic.  The F150 Manual has a footnote that says to use 4 oz of friction modifier for 8.8 inch and 9.75 inch Traction-Lok axles.  The Raptor Supplement also specifies 4 oz of friction modifier with no mention of the type of axle.So how the hell would anyone know whether the manuals that came with their vehicle are still accurate, or whether their manual has been superseded by more recent guidance???</blockquote>