-06 torsion bars,keys,bolts or something else different than -03 ?

[Hammer]

I can gain approx 2.5" more from 28.5" to~31" from center to fender . we have very bumpy roads here so it really makes difference how torsion bars are adjusted for example at this height (30.5"center to fender) way too stiff...

I know that article but thanks alot very good information.

Cognito leveling seems to be only good front leveling kit but I dont know will it work with rancho 4" lift they do have also new upper control arm kit for lifted applications but it doesnt give more lift I think. I have send them email but no answer yet ...