I would recommend AMSOIL in your entire truck. As you may already know, AMSOIL has been around now for over 37 yrs. They were the first to have a 100% synthetic certified by API and have never looked back. By comparison ASTM standardized testing they make the best 10w-30 and motorcycle oil on the market today. It only goes to reason that their diesel oils are of the same quality, however a comparison of Diesel oils has yet to be accomplished. They use Group 4 (best) chemical base stocks and additives for their products, not petroleum.
Check out this article - Truth in Advertising: BP vs Royal Purple
AMSOIL has a great Product Application Guide
that will let you know what type and also amounts of fluid for engine, trans, transfer case and diffs.
Let me now if you would like a quote.