How do you crank up torsion bars on a 2005 durango?

Most torsion bars have adjuster screws or bolts on the bars. When you tighten one side you have to tighten the other side the same amount. If you don't it will make it will make the vehicle sit crooked. So measure both side then tighten the accordly. If you tighten them up to much though you can break them as they are designed to work in a specified range. If you're looking to lift the vehicle check out a proper lift kit.