[Purdy Swoft]

I wouldn't beat on the drain plug too hard .

Cast iron threads don't give like steel threads .

Replacing the transmission case isn't an easy job .

The back end would have to be removed first . .

I would use the pipe wrench .

If the handle of your wrench is too short , slip a longer pipe over the handle for added leverage .

Be careful not to jerk of knock the model A off of the stands while you are under it .

If heat is used , heat the case around the drain plug rather than the plug its self like Patric k L suggests .

If the plug is first heated , expansion from the heat can also cause the drain plug to expand and get tighter .