2005 Chevy Silverado 2500HD with leveling kit

2005 Chevy Silverado 2500HD, 4.10 gears, Flowmaster exhaust, 5" Chrome tips, K&N Cold air intake. Off Road Unlimited Level kit. 285/75R16 Mud kings, on Chevy alloy wheels. I plan on putting on a Solid axle up front, coil overs at all four corners, 12" of lift, 40" Trxus tires, and 5.13 gears. Mike DiFalco, Kresgeville, PA Link to Chevy, GMC lift kits