spay a lubricant/wd40 around the center of the drum..
use a hammer and beat around the out side of the drum,this may jar the center of the drum loose and will also unlock the shoes from the drums..you will need to get a little ruff with them
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REMOVAL PROCEDURE Construction of this drum and hub assembly does not allow replacement with the hub assembly installed on the vehicle.
REMOVAL PROCEDURE GM replacement brake lining material is recommended for all vehicles to maintain the balance between front and rear brake performance. GM replacement brake parts have been carefully selected to provide the proper brake balance for the purposes of stopping distance and control over the full range of operating conditions. Installation of front or rear lining material with performance different from that of recommended GM replacement parts can change the intended brake balance of this vehicle.
NOTICE: Do not over-stretch the upper return spring. Damage can occur if it is stretched to more than 204.2 mm (8.04 inches) .
NOTICE: Do not over-stretch the lower return spring. Damage can occur if it is stretched to more than 107.3 mm (4.22 inches) .