Looking to maximize the power your Mustang puts to the ground? There might not be a better upgrade for your Mustang than traction bars. Traction bars help plant the rear tires during acceleration and increase available traction. You might have heard them referred to by other names, Lift Bars, Trailing Arms, Solid Control Arms and many others. But they all serve the same purpose - transfer as much of the car's weight to the rear axle during acceleration.