Add assistance to your factory Ford overload with Hellwig's new Big Wig helper. Get help sooner with the the Big Wig helper, as the vehicle is loaded the Big Wig helper comes into contact with the contact pads sooner and gives support sooner for heavy loads. Works with factory contact overload on your Ford Super Duty. Hellwig factory overload assist springs mount directly to the factory contact spring. They help brace the contact springs assembly when they flex beyond a set point, to increase the truck's level-load carrying capacity. In normal use, they leave performance unchanged.