Friction Modifier Question

lsmit541

New Member
Nov 16, 2009
22
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2
Michigan
I'm getting ready to swap out the factory diff lube in my 07 GT. Has anyone had experience with Lucas synthetic 75W140 without adding friction modifier? Lucas says its not needed, but Ford recommends it in the manual. My thoughts are to add it, but I'm wondering if it could get "too slippery" and affect the locking action.
 
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I read that all 75w-140 weight gear lubes are already formulated for limited slip rear ends. A few that I've checked the label on all say they are formulated with the required additives for an LSD.