I have a 2001 sierra 1500 I already have spindles with my keys backed out in the front (I have drop keys on the way. also I have a axle flip kit for the rear. not installed.) with drop shackles on the rear with the blocks taken out. do lowering control arms, drop spindles, an drop keys all work together? (I have the rear figured out for the most part.) I really just want a 6/8 drop on my truck.