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"The coefficient of thermal expansion of aluminum is greater that that of brass, depending on the actual alloy. I would assume the transmission case is some aluminum alloy. To help loosen the brass plug, you should actually heat the area around the plug, not the plug itself for best effect."
Yes and no, heating the case could melt or damage seals or even worst cause the case to crack (it is a casting after all) and using the wax method you are actually heating and then cooling the plug whitch expands the plug and then contracs it (cooling the plug with the wax) pulling the wax in the gap created in the threads.
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