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There are a few different techniques to get that bolt off. I soak it with PB blaster everyday for a week, place a jack under the trailing arm to hold it still(to prevent the shock bushing from absorbing the impact), and use a mallet and boxend wrench. (Poor mans impact wrench)
But what you're saying is that you broke part of the trailing arm? I don't know what else to say than replace the trailing arm. And that you may want a shop to do, because you'd have to remove the brakes, hub bearing unit, knuckle, then try not to kill yourself unbolting the arm with the damper still attached. If you find an easier way to do it, let me know.
Can you take a picture of the area, in case I misunderstood the problem?
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