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I installed US Cartool connectors in two cars, one was an A-body convertible. They both had torque boxes already in them from the factory. I slotted one set of the boxes and peeled back the other set to be able to weld the connectors completely to the frame. I then welded the boxes back up. The difference in chassis rigidity in both cars was amazing!

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Do those get welded solid to the floor? I'd like to add a set to my '67, but it was undercoated when I got it, and I've since added a bit more. I'd like to add the connectors, but hate to think about removing undercoat to do so... I'm pretty sure I know the answer here...