Hey guys I'm new to this forum and I'm looking for some advice. I have a 1999 gmc Sierra reg cab stepside and I have a 6 inch fabtech lift and 35 inch tires. My question is I have a set of 40 inch tires that I want to put on my truck and I wanna know what it will take as far as lift options to get them to fit... I know I will need a 3 inch body kit but what else? Leveling keys? New rear leaf springs? Any help would be great.