I think its like the majority of auto transmissions from the 70s onward: no drain plug (there are exceptions), so you remove the pan to drain it. Filter inside the pan. I believe it DOES have a dipstick for maintenance, rather than a tool insertion port like the Chrysler NAG1 and 8HP (both rear-drive).
Did some googling: it has a test port (ie, a dipstick TUBE where a level test tool can be inserted and fluid can be added) but doesn't come with a conventional dipstick. In other words, its exactly like the NAG-1 and 8HP. I wouldnt' call them "sealed for life," but they are designed so that you measure and add fluid using a test tool and the OBD-II transmission temperature readout, rather than "check when warm, idling in neutral" like the old days.