4\" Suspension Lift I own a stock 89 K5 350, w/700 tranny. I want to make it bigger. the problem is it is my daily driver @ 15mpg. It currently has 31's on it and rides great. I want to go with a 4" lift and 33-35's. Any one done this already and is very pleased with the ride. I want springs in the back no blocks. Any suggestions before I get started..Thanks..