One of these is real handy for removing seals whne there is no shaft in the way. Around $10 at most auto parts places, and harbor freight. Sorry for the oversized picture, but I was to lazy to copy and resize it.
and where the shaft is in place, such as the final drive, one of these slide hammer dent pullers with the screw end works. You may have to use it in 2 or 3 places around the face of the sela, pulling it a little in each one and moving to the next. Usually available in the $12 to $15 price range.