+1 to AMSOIL products. I have the 75W-140 in the rear, 75W-90 in the front and the AMSOIL ATF in the T-case. Like mentioned before, make sure you buy two pumps to go along with them (it'll make life much easier).
I'm a customer that likes the products so much, I bought the company...or at least their Preferred Customer membership.
Changing all of those is easier than changing the engine oil (no filters involved). Make sure you read the "How To" threads about all of them. It makes it a breeze.
Here's something you might find helpful:
http://www.amsoil.com/scripts/runisa...msoiloaf:index
Good luck!

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2006 Granite Crew Cab SE 4x4 w/ Big Tow
285/70/17 BFGoodrich All-Terrain T/A KO
DIY Air Box Mod w/ Drop in AMSOIL EaA Air Filter
Sway-A-Way Coilovers w/ PRG UCA and Sway-A-Way w/ Reservoir Rears
TomTom One XL Navigation
AMSOIL Signature Series 0W-30, 75W-140 Severe Gear and 75W-90 Severe Gear
Magnaflow 18" muffler swap (PN: 12256)
2* Timing Advance
PRG Shackles (
Still need to install these...)