I have a all stock 2005 ECSB 4x4 2500HD 6.6 . I am wanting to drop the rear of the truck with either 2" or 3" Belltech lowering shackles. Will these shackles actually drop the rear of the truck a full 2 or 3" or do they lower it less? I want to level the truck out and the rear of the truck sits 2.5 to 2.75" higher in the rear. Is it a direct replacement of the stock shackles without having to remove the overload spring or anything. Also I have 285/75/16 Tires on it with no rubbing issues do you think lowing the rear will make any differnce in the front to cause any rubbing? THANKS