Torsion bar suspensions are pretty easy to misunderstand. I know I didn't get them for YEARS. Which is why I ran drop spindles for so long. But the whole concept of pre-load doesn't really apply to torsion bar suspensions in the same way that it does to coil spring or strut type suspensions, so there ends up being a lot of misconceptions, especially about the torsion bar adjusters and what role they play.
On a coil spring or strut type suspension, ride height is tied directly to how much the spring is, or isn't, compressed. On a torsion bar suspension, ride height is almost entirely separated from spring loading. Which is why it's so easy to change the ride height on torsion bar suspended cars. The only problem we run into with the old mopars is that they're too undersprung to reduce the amount of travel very much. But with a larger set of bars, you can do almost anything you like with the ride height as long as you can still get the car into the correct alignment specs, because lowering/raising the car does change your camber, caster, and toe. That's another reason why you can end up with negative effects from lowering the car with the bars. If you don't correct the alignment once its lowered, it won't handle right.
