my car has small cracks in the 1/4 at the rear of the 1/4 window , that has to be body flex
I have those same cracks about 1/2 inch or less, but still dout that is related to a lack of torque boxes, just flex you would get it even with the boxes imop especialy when your hammering the car hard. The rear TB's just give added strength the to the forward leaf spring mounts, the forward TB's imop add minimal stiffness to the body at best ,to really tighten up the body it takes frame connectors and a roll cage, body flex is just the way it is when your dumping the the clutch at high RPM's,,,,,,,,,,, just my input, but what do I know
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Torque Boxes are cool
, just another way that Ma Mopar was saying this car was made to rock
, but there not nessasary, plenty of Mopars get it
at the track and many do not have TB's ,,,,,,,,,, I am going to put them on my car some day but is all about cool and a little extra strength nothing else.........