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What is the best gear oil for the front differential and rear differential. Haven’t changed them since I bought the truck 5 months ago. No clue when last was or ever. What would u recomend to use
 

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You don’t really say what you have, so I wouldn’t expect too many responses.

I use Lucas 75W – 90 synthetic in my Dana60 front, and my Dana 80 LS (DRW) rear, as well as in my gear vendor OD.

It seems that Ford has changed the specs on the rear dif oil multiple times, but this weight oil has been recommended in the past, and it is what gear vendor calls for now, so I use it in everything. The last time I changed my rear diff oil, it came out so golden and new looking, I had to break out my phone and videotape it as it poured into the waste oil pan.
 
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