The reindexers just allow you to increase the maximum lift. They are typically used if...
A) your truck is old and the torsion bars have started to sag, or
B) if you want more lift than what turning the screws all the way in provides, which in a new truck could be beyond 3 inches - not a good idea.
As far as the comment regarding ball joints goes, it is true that lifting by Tbar "twisting" can accelerate damage in some vehicles, especially S-10s. What is not true is that the re-indexers will avoid this damage, the reindexer is the same principle as turning the screw on the T-bar but increasing maximum lift. What causes the damage on the S-10 truck ball joints is the angles at which the ball joints operate, and the overall design of the front end components.
I had an Explorer in the past with Tbars at 2" for 4 year and never had a problem, so it depends on the vehicle.
I'd recommend start with 1-1.5 inches and no more.
Good luck!
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