727 Disassembly and Advice

Lately I've been using a little brass wire wheel on a dremmel for little cleanup jobs that I don't want to get to much material off...
It looks like condensation moisture likely got into it...
On my last transmission, where I got one from a guy... blah blah blah and I went to rebuild it. It had some rust issues like that inside from being in an outdoor shed... Just getting through the heat and cold cycles and moisture...
Anyways, definitely, without question. Pull the pump apart on the front of the transmission that you pulled out first...
There is extremely tight tolerances in there, and if those gears get moisture and rust on them and go uncleaned unlubricated and unfreed. It's likely you'll snap the snout off your torque converter at the first turn of the key... if it moves at all... l o l..
I was glad I opened mine.. as soon as I did I said to myself that's not good.... watch the videos, on scribing them and things like that to get them back where they were..