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I'm not familiar with either kit, however, just using extended shackles will have a couple of downsides. First is that it only affects one end of the spring, lowering it will serve to rotate the axle housing. Now here is where my ignorance of LC comes it...I don't know if the factory used double cardan type joints in the rear driveshafts. If they did then no real problem, if they didn't, rotating the axle housing will put the u-joints out of phase causing vibration and premature wear. Another downside is that you are using old springs in the back and new in the front, so depending on what kind of usage your truck has seen, it may not lift evenly. All new springs are more likely to give an even lift, and aftermarket springs often have better ride characteristics that the factory ones, they are also engineered for the amount of lift. A spring with more arc to it can compress farther before going into negative arc which is very hard on the spring. A stock spring with an extended shackle can easily be overarced before hitting the bumpstops greatly shortening its life.
Hope this is helpful
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