I have a 2004 Chevy Tahoe 2wd, factory 16 inch rims. I just want to lower the rear a few inches, I was going to do this with lowering springs. So my questions are... 1) what brand of lowering springs? 2) what will I need to keep a somewhat factory ride (shock extenders,new shocks)? 3) How hard is it to change the springs? 4) How much and in what way will the Tahoe ride differently? 5) Is 3 inches too low, will I bottom out any? Any help and information will be greatly appreciated. Thanks!