Join Date: Oct 2001
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Re: Gear Lube Question
I have no idea what those spec numbers mean.
I believe ford spells out 85w-90 gear oil, 85w-140 if towing and/or in warm climate is acceptable too. Any gear oil with those weights, from say valvoline or name brand, will meet fords requirement. Then make sure you put the modifier in if equipped with crap lock. fluid level should be between 1/2" and 1/4" below fill hole.