ok guys im tryin to lift my truck a real cheap way. and need to know how many inches i can go before needing longer control arms. . im either goin to buy the sky jacker d45 springs they will give me 4". or buy the 3" spacers that goes on top of the factory spring. and in the rear just put a couple of leafs in untill it levels out nice. . the other question is who out there has a lifted dually, i need to figure wheel spacers out. and tires please any input would be great. thanks guys