If you do a spring over in the rear you will probably get 6 inches + of lift and still be left with the front torsion bars to lift, you may be able to get a couple inches by cranking the bejesus out of the torsion bars and then use small blocks or an add a leaf in the rear to match. Not any cheap way to lift ifs truck. Either use add a leaf in the back and crank the torsion bars up or do a solid axle swap in the front or spring for a complete lift kit. And I know everyone knows not to use blocks on the front of anything with leaf springs. I run 31.10.50 15 and are more than enough tire for my stock Durango.