muck the slop out and add the new oil?
Sheese,, no offense but I can't understand why people keep asking about such a sloppy, half-assed way to service a helical Maytag trans.
As mentioned before and clearly shown in service manuals after the outer tub is off the whole trans is easily removed after taking out the stop lug screw and main drive pulley, then one can place it on a work bench, or whatever, and have at it.