[Hellz]

Tools you will need:

3/8 socket wrench
something to drain the oil in to
5 quarts of 75/90 gear oil

Optional: about 1 ft of 1/2 tubing to make it easier to put in new oil.

on the front diff, use the socket wrench to remove the top fill plug
use the socket wrench to remove lower drain plug
drain in to whatever bucket.
wipe off drain plug ( its magnetized, and will have alot of shavings on it)
put drain plug back in

from diff will take 1.5 quarts ( plus or minus some) fill it till it starts to come out of the fill plug hole.
put fill plug back in and done with the front diff.

rear:

should be a rubber gromet for the fill plug.
pop it off and place your oil pan down.
remove drain plug with socket wrench.
drain oil
replace drain plug, and fill till it starts to come out of the fill plug hole.
maybe about 3 quarts give or take some.

this whole job can easily be done within 15 minutes.

once you have done it, you will laugh at the fact that oil change shops charge $75 to $150 to do that simple job.