Shackles will throw off your caster on the front end and can cause a misalignment of the angles between your transfercase output and pinion. The caster change with only one inch of shackle lift(the shackles would have to be 2" longer than stock) is negligable, but you might get some vibrations in your rear driveshaft. Also without much larger tires the shackles will decrease you aproach and departure angles. I didn't like body lifts either but I installed a 1" kit on my jeep and it only took about 1 hour and it is almost invisible. The extra room in the fenders is great and it didn't effect my suspension at all. A 1" body lift is only about $80, while a complete set of quality(no jc whitny cheapos) greasable shackles could cost up to $150. The choice is yours but If it were me I would save up some more money and invest in a 2.5" suspension system.