No need to buy specialty transmission slide hammers in order to remove your 727 based transmission pump.  This adapter allows you to use your common slide hammer with a 5/8-18 thread.

Using two slide hammers is ideal but it can be accomplished with only one if you progressively go from side-to-side.

Simply screw this adapter to the end of your conventional slide hammer and then screw into the pump for removal.

Note: does not include slide hammer in photo, just the adapter.