I only have a few answers.

Re-indexing the front torsion bars is much easier then I thought it would be, and replacing them would be easy too.
With the front wheels off the ground, all you have to do is take out three bolts where the torsion bar connects to the lower control arm, and slide the connector back about 3 inches.
Then that end is disconnected and you just slide the other end out of the anchor.

As for AAL's I have the Calmini ones (~$150, two leafs per spring) and they work great.
They corrected the sag I had developed plus added 1.5" of lift, and the ride is much smoother than before, not stiffer.
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-Dustin

Xterra101.com