As for brands that a personal choice. I like Yukon Gears.
You'll need ...
ring and pinion sets...both front and rear.
Master install kits to include all bearing and seals
fluid of your brand choice.
and a PROFESSIONAL installer.
Gear set up is not something to be done by the average do it yourselfer.
YOU MUST DO BOTH AXLES if you want to use 4wd ever!!!
Alot of shops/installers will not warranty parts not purchased through them.
My suggestion is you check around your local shops for a shop you trust for prices. They can help you with all the parts you'll need.
Average price for front and rear gear install...$800 to $1600.
Any more questions let us know.