you can crank the torsions by turning the adjusting bolts clockwise, there is one adjusting bolt at each end of each bar. usually you can get about two inches out of em whcich usually levels the 150's out pretty good. i put new keys on the end of mine, new keys will re-index the bars as opposed to loading them with more stress. i got my tough country kit for 120 bucks, well worth it. the bars have to be unloaded though, which depending on experience usually isnt too difficult, care just has to be taken.
but a t-bar crank and a front end alignment is a pretty good and easy way to level up your truck. ill get some pics on here of my ride and you can see how much more level it is compared to a stock truck.