75w-90 for the diff fluid or go to 75w-140 if you tow a lot.. As far as brand, I think you're good with any brand you prefer.. I know some folks like to run the same brand in their diffs, trans and engine oil... I was going to go with Mobil 1 in mine, but ended up going with Royal Purple as I've always had great luck with Royal Purple fluid in my transmissions I've worked on in the past even on FWD cars...
Bookmarks