Ok i have a 2wd ranger and I have helped many friends lift both 2wd and 4wd trucks, the cheapest way to lift your truck would be a 3in body lift, but that prolly wont get you as high as you are wanting beyond that you can get an expensive suspension lift or you can get 2 in add a leaves for the rear and lift coils for the front for an extra 2 in of lift, combined with the body lift thats 5in and will prolly give you enough room for 33's with the right off set on the rims.

go to offroadrangers.com and to rangerpowersports.com they have lots of info on this stuff.