Unfortunately, most of the Volvo rear ends with drum rear brakes didn't come with a drain plug.
So the only way to properly drain the diff oil is to remove the cover and you should be prepared to change the diff cover gasket.
FYI, the diff cover gasket is the same for all the Volvos with a Dana/Spicer rear end and the same as Jeeps with a Dana 23,25,27 or 30 rear ends.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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