Hello.There is a cheap,very effective tool to remove the rear drum on early rear drum Volvos.All you need is roughly four feet of medium-duty chain,a long handle(i.e.a handle section from a floor jack,pipe,etc.) Attach the two chain end links to the drum by passing a wheel bolt through each link.Then place the pipe through the chain loop and with both hands at top and bottom of the pipe,whip the chain by pulling outward a few times until drum comes off.