I just played with the jack until i "balanced out" the pressure so that the bolt was easy to remove. I didnt' use a hammer or anything, just smacked the bolt with the end of the wrench and then pulled it out. It took me a little while to get the pressure off of it just right. I didn't take the wheels off or anything, just jacked up the back until the pressure was off the leaf spring, pulled the bolts, then reversed the process with the new shackles.
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