Control arms since a properly set-up control arm will use the twist from the axle to plant the tires. The Lakewood Traction-Action control arms change the mounting point of the arm on the axle to accomplish this while others do it by adjusting the spring perch. Another way is the replace the uppers w/ a torque arm/panhard bar (or Watts Link) combo. Drag springs and shocks also help as well as wider, stickier tires.
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