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131 0306 TORS 03 K Z

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The beauty of a torsion-bar suspension is that all of the mass and spring stress is concentrated low and inline with the truck's frame and beefy lower A-arms. That's why torsion-bar-equipped trucks have wimpy-looking upper A-arms stamped out of steel or forged aluminum like on this Dodge. They don't need anything stronger. Torsion bars have been popular with the OEMs that offer IFS 4x4s because they keep the truck's center of gravity low, leave room for big CV-shafts, and offer the lowest potential unsprung weight of any suspension design.