Too many words
No one felt like spending an hour typing to explain.
You need a special puller, which can be fabricated. Details of how to do this are in the ATSG manual, you can get a manual from Bruce. Anyone considering working on there own trannie should get one before starting.
I would recommend getting a complete pump from Bruce. If you disassemble your pump the halves must be aligned with a large pipe clamp, again in ATSG.