I know what it means to box control arms but I have some questions you guys may be able to help me with. Do you need to use a specific metal to box the arms? Does anybody know what grade of steel the factory arms are? Instead of just boxing the arm with a plate, should I also have the u-channel reinforced before boxing? The bushings should be replaced after boxing and not before, correct? Boxing lower ones is the minimum needed but boxing the upper ones also is not a waste of time, correct?