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How to remove those rear brake drums
You must use a drum puller. These are big heavy pullers that bolt to the drum with the lugs. They have a great big screw shaft with a spinner on it. You turn the screw in against the axle shaft until you can turn no more. Then you beat the spinner with a hammer until it goes "POP!" No lie, I'm not making this up! It is vital that you keep the axle nut on; just loosen it. When the drum goes "pop," incredible amounts of energy transfer.
I found a video that shows the basic setup. There are several styles of pullers, including the one shown. OTC makes a very common one as well.
Some people have been lucky to get away with a front wheel drive hub puller, but if you have an obstinate drum they will probably be too light.
Your number of hammer swings may vary!
It's supposed to be fun!
1949 De Soto Custom Convertible (project)
Here's another YouTube video showing rear drum removal on a '51 Plymouth Cranbrook. More of a shade-tree mechanic using an Amazon sourced puller, but very well done and informative video.