you need various carrier shims, pinion shims, a crush sleeve, a pinion seal, and gear paint/paste...
or just get an installation kit which also comes with pinion and carrier bearings.

some additional tools:
shop press
inchpound torque wrench
pinion depth tool or depth micrometer (using a depth micrometer requires calculating bearing center).

i had the rear end out and sitting on stands. my kit also came with a video. between the service manual, video, and online forums, i got it done.