I'm not sure I understand your question. "Re-indexing" is simply a way of re-clocking the torsion bar adjustment arm so it has more room to swing (and therefore to adjust ride height). Re-indexing is only necessary if the adjustment arm
has run out of room to swing. The arm is just pulled off the torsion bar end and rotated a spline or two to gain more swing room. Apparently the factory was fairly casual about where the adjustment arm was placed on the torsion bar...of course they weren't anticipating folks raising ride height by 3" or more. But re-indexing is only occasionally necessary for some vehicles, most don't need it.

"Cranking" torsion bars refers to turning (cranking) the ride height adjustment bolt, which pulls or pushes on the adjustment arm, rotating the arm, the torsion bar, and the lower control arm at the suspension, thereby changing ride height.

Whenever ride height is adjusted, total suspension travel is unchanged. However, the resting point within that range of travel does change, so if you adjust ride height upward by cranking the torsion bars, you are exchanging available downtravel for uptravel. Continue to lift the vehicle ride height and at some point you have so little downtravel left that ride quality and safety are unacceptable.

Does that answer your question?