Thanks to Daryl, Todd, Terry, Ed, Rick, and "Whiskey" for suggestions.

With the transmission out of the vehicle, I removed the plugs by
application, three times, of 10-seconds of propane torch flame to
aluminum areas around the steel plugs, and by the rather easy loosenings
of the plugs with a short, appxroximately 2", - 17 MM,  transmission
"male" tool on a socket wrench.

Caveats: be very sparing of the flame on the aluminum. It heats very
quickly.

Tom Hanlon
Palm Springs, CA
84 Westfalia