To get the bearings out you would have to remove both final drives and the bearing cup and seal casting out of both sides and then lift the differentral out the back with the power takeoff housing removed. They are pressed on so will need to be pressed off.
I doubt you want to remove that much to get the bearings to put in oil seals on the inner pinion shaft. There will be shims behind the casting that holds the seal. With the four bolts out I use an old wood chisel working around the outside to start the casting out, then larger screw drivers. It is a tight slip fit. It will not move with much cocking.
If you are taking out the differentral make sure you put the shims back the same way they come out. If you check and it has slop in the gears and you decide to tighten it remember if you remove a shim on one side it must go back in on the other side. You don't just leave it out.