Re: removin upper a-arms ?
Since those hold the alignment, many shops will over tighten them, so they can end up really tight. Ideally an impact wrench would be best, since it doesn't side load the stud like using a wrench or socket.
With that said, if you break them while trying to remove the nut, they needed to be replaced anyways. In my 30+ years of wrenching, I have never seen one of them break unless the car/truck was in an accident.
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