Diff oil super confusion

Good morning Guys,

I am so absolutely freaking confused about this right now.

First off, for the life of me I cannot seen to find diff oil that does not have the LSD additive already in it. So can I use this LSD lube in my brake controlled LSD set up (2010 DCSB 4x4 Base)

Second, Synthetic vs conventional?

Third, 75W90 in the front diff and T-case and a 80W90 in the rear or 75W90 or 80W90 all round??

Thank you for your clarification on this in advance.

 

Yep^ I just use Mobil 1, but if you tow/haul/offroad often I would just use Dino because you will have to change more often.

 

I was just going through the same thing.
I grabbed a couple gallons of lucas 75-90 and a bottle of redline additive for the rear.

 

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Thank you for everyone's input I really appreciate it. I will probably go with the mobile1 75W90 synthetic.

 

I did a post about this a year ago... by recommendation of (Toyota trained) tech and four wheeler, here on TW, I used Mobil 1 '75-140' in the rear diff and '75-90' in the front and transfer case. Been great ever since.

 

75-90 Amsoil all the way around on my Tacoma and my A4 quattro. No issue out of either one.

 

Both diffs and tcase= 80w90 non synthetic.