Seals and O-rings do tend to deteriorate just with age - even if not driven much for several years. You should be able to get at the shift and kickdown/throttle shaft area - if exhaust not in the way. It is cramped there at the best of times. But, if car high enough to (safely) get underneath, one option is to remove the neutral/backup switch, carefully, with large pan underneath. This will allow much of the pan fluid to drain. Be prepared as it will tend to go sideways as the threaded hole points. I believe this opening is below the shaft seals entry so if these two seals are to be removed it sure helps to have fluid not pushing against the underside (of the seals) - to avoid extra mess. The smaller/inner seal is on the kickdown shaft and larger outer one works on the shift selector shaft. It is metal-encased but sticks up a bit so a thin, sharp tool can be tapped into it to gently pry it up and away. Not really difficult but can be tiresome. Be patient. There are a few tips to get replacements back in but mostly common-sense (and patience). The larger seal can be tapped in with a 15/16" socket and suitable hammer - depending on access. Wouldn't hurt to check the kickdown band adjustment but I would wait until pan and gasket removed then low-reverse band also adjusted and of course new filter and gasket. Also note that the cooling line exits just to the front of the shift shaft so this is another place for fluid to leak.