I have a 99 Tahoe, 4door 4x4, I have leveling keys in front, and 1" block in rear, on 33's! I am ordering my 6" in a week or so, I am also going to use my lift keys and block as well, now I am debating on a body lift, but not sure however I do want to run 38.5" boggers, but will also have a set...