HRPartsNStuff sells a tool (#0599 $89.00) that will remove/install the bushings
in the differential housing. The rest of the bushings can be done on the bench
with the control arms removed. Hope you're not dealing with a lot of rust, that can make for a tough day.
HTH
Mike.
Depending on how old they are removing the old ones can be easy or hard, usually hard. One of those C-clamp ball joint presses comes in handy but remember to put blocks inside the arm or you will crush the arm. Some of mine I had to drill the rubber in the old bushing and removeit in parts so the shell would come out.
Put the control arm in a vice and heat up the bushing until it melts a little and you can push it out. Then use and air chisle and pop out the metal part