Definetely try drawing the arm up further into the cross member first, and see if that helps...

If not enough adjustment, then re-indexing works fine too.

The only difference between re-indexing and adjusting is that you take the adjuster anchor's end of the bar out, lower the arm a bit, and put it back in...so that you can twist it further on the way back up than before.

If not rust welded in place, its a 15 minute project.



(I can't open the above links...here's my versions on hand...)

Back of aduster area, from rear of truck:


Front of adjuster area, from front of truck: