Well i have been looking at lowering my 2005 z71 2wd tahoe with a 3/5 drop. I have seen tons of kits from kits that only havetorsion keys and springs to kits with control arms, shocks, and all these different things.... I talked to someone who had a yukon and all he did was replace the rear springs and toghten or loosen his front keys and that looked perfect. Can someone tell me what i really need to buy-do to get the drop?