You can purchase a drop drag link at 4wheel parts or through just about any place that sells superlift.
To do the ball flip you have to grind the factory weld off the j-arm then press the ball out of the arm. Then install is reverse, finnishing with a good clean weld. When doing a ball flip you will also need to rotate the axle end of the draglink by rotating it 180*, to connect back to the newly fliped ball. To accomplish this you will have to cut the draglink in two, find some tubing to sleve the factory draglink, drill mutiple holes in tubing for plug welds then, weld it up with some more good and clean welds.
