GM for 2006, as far as Z71 vehicles go will be giving their trucks and SUVs a high, LEVEL stance(Thank God). The fullsize truck will be geared towards outdoorsmen. Some Z71s sit level from the factory now, but a majority don't, I guess so many people complained they changed. Otherwise you had tighten the torsion bars, or use some kind of Ford Key in the torsion bars to make them sit level.