There is a lot of knowledge that needs to be spread in this thread here.
Re-indexed keys plus reefing the torsion key bolts down is NOT a good idea..
Turning them bolts clockwise is turning the keys which are twisting those steel bars called "Torsion bars" twisting them bars is forcing the lower control arms downwards making the front of your truck sit up higher.
Those torsion bars are adjustable so after time you can adjust the stiffness of your front end when the bars fatigue. Also to support snow plows.
But when kids found that out the whole thing with cranking them home to lift your truck gave them a bad name.
Your bars are shot, so don't bottom out your bolts thinking you can lift your truck, you are putting a LOT of stress on them bars, so when you do hit a bump now your bars are going to twist (if there is any possible flex left in them) and REALLY stress them, I have seen them broken (mostly on ford trucks). Find some 3/4 ton bars.
If you plan on doing your own work, READ UP ON TORSION BAR REMOVAL. They are extremely dangerous because of the amount of load they hold, you need a special tool to unload the bars. Also a torch to remove the keys, or an air hammer.
I was able to gain 1.5 inches from 5 full turns per bolt. I still have about a half inch of threads left, if I were to crank them home and drive around, I would have severe angles on my front CVs causing them to prematurely fail, I would have severe angles on my upper and lower ball joints causing them to prematurely fail.
A real suspension lift for the suspension set up we have (Independent front suspension) or IFS, would have drop brackets to drop the front differential down along with drop brackets for upper control arms, so a real lift drops everything down at once so you don't have the severe angles.