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So, this is kind of a tricky one. I wouldn't say it's necessarily a bad idea, but it's a specific use case, really. Not to negate or insult your buddy's knowledge and experiences with this, just providing my own based off what I've done with my trucks. 75w-140 is a good recommendation for gear...

Hell, I'd send it to you for free if you want it. If it goes to someone that can use it, that's all that matters to me. Sometimes you just gotta pay it forward.

No worries, we're all here to help. Speaking of helping, can I interest you in a spare hub for your dually rear axle? I ordered a replacement one for my 1031 not knowing my hubs were the single rears instead of the duals. I know it won't fit on my truck, but if it can help you out, I can send it...

At that point you're just wasting money. Since the Lucas already meets the requirements for the LSD clutch packs, you won't be gaining anything by adding it to gear oil that already covers it. Just make sure that it specifically states that it meets those requirements before you dump the old out...

I personally wouldn't mix GM and Ford products like that just because I know their fluid specs and requirements for fluids don't match and certainly don't mix well, so that knocks Motorcraft off the list from me. The Oreillys has one bottle available that's the perfect amount for a change so...

So, the LO does not really cover this, but your front Dana 60 differential is a limited slip diff with clutch plates in the carrier. Some modern age fluids have the specs covered for limited slip differentials, but not all of them do. Your rear axle/diff should be a detroit locker and thus does...