I have a 98 Durango and want to put 35s on it. do I need to lift it?? if so, would 3" be enough?? what's the best way to lift it?? it has torsion bars up front and leafs out back.  

You will need to lift it, I know Rancho makes a kit that will give you enough room, and i think tough country also makes a kit, but i'm not sure.