On the more common setup, the spring hooks into the equalizer lever and then hooks to the frame. on the threaded rod/cable setup, it hooked to the end of a hole that was drilled into the cable, then either hooked to the frame or to a body crossmember. I dont have any broncos here with that setup. There are springs on the ends of the cables in the drums that should release the pedal without an external return spring when the whole setup is properly set up with minimal slack.