i have a z71 ext cab with a 4" inch lift on the front and 3" on back with 33" tires, 18" wheels. im looking to upgrade, quite significantly. i was thinking 6" lift with 38" inch tires, but also put some spacers or w/e to make them stick out. can some1 tell me if those tires are too big for the lifT? also, would i have to take out the body lift in order to install the suspension or will it be just added to it?