Dave, I've heard the term torque box several times in connection with Mustangs, but what exactly is a torque box?
TB's are basically structural anchor points within the unibody type construction. they will be located in critical connection areas for various reasons. Usually to do with load bearing connection points for suspension components. The rear TB's on this stang carry the front eyelets of the leaf springs. Which is kind of a big deal...
The front TB's on this car support the front frame rails, they help attach the frame rails to the body at the firewall, rocker, forward floor pans and trans crossmember points.
Front and rear torque boxes on this car tie heavily into the inner rocker, the rockers basically connect the front and rear portions of the "frame".
instead of having an iron frame loaded with suspension, axles, steering components etc with a body set on top of it, these cars have no "frame" they are a body that is reinforced on the bottom side with added provisions to support the suspension/steering components directly to the body.
That's why when you hear somebody with a camaro, a mustang, a road runner, a charger, cuda, challenger etc bragging about their "frame off restoration", you should wind up your leg, go on ahead and punt their little man berries straight up into their neck area, then punch em in the neck.
