Your vehicle can have either a Dana 35 or Dana 44 and you need to know
which one you have. The axle shaft has to come out of the differential
housing. Pull the shaft, bring to your local auto parts place and have
them press the old bearing off and the new bearing on the shaft.

 The Dana 35 axle shaft  is held in place by a 'C' clip on the inside
of the spider gears. Take off the diff cover, pull clip, remove axle.
the Dana 44 has a retainer on the outboard end of the shaft, under the
lug bolts. Remove the 4 retainer nuts, pull it out. Both of these are
tight fits, pulling the axle shaft may take some grunting. I usually
wrap a chain around the lug nuts, other end to a 55 # anvil (or concrete
block), swing the block to get some force on the shaft.

It's not a horrible job on either style but it's enough of a job to make
sure you really need a new bearing before tearing into it.