Sportrak how to ajust the torsion arm to give a 2"

Forum: 

i`ve got my self a 1998 Sportrak to do a bit of off roadin. no prob with the rear end shacke (still not shore if a needed to change the shocks or not) its the front end i`m in need help with. So if you can help me with how to ajust the torsion arm to give a 2" i will be one very happy off roader
Ray