Tekno, you have 75w140 as it's a DANA M226 locking rear, like mine. I used Motul full synthetic, $24.95 a litre on Amazon, but any quality synthetic will be fine, the locker is electromechanical so does not require any extreme duty or limited slip additives.I have a 2013 Pro-4X with 91k miles.
I bought it two years ago with 67K miles, I should have changed all the oils right away since I do not have a history about the truck besides it looking as tho it has been really well cared for!
I just changed my tranny oil, flushed brakes, power steering.
I want to do the rear diff now, what weight oil do I use and RECOMMEND BRAND?
Then transfer case, what weight and RECOMMEND BRAND?
Anything I am missing?
Transfer case is ATF, used Motul for that too.