I have a 88 3/4 ton Suburban with the 6.2 diesel. The lift I am thinking about is all offroad design stuff. Tuff country front springs heavy duty shackles and zero rates to locate the axle 1.5 inches forward. In the rear I plan on a shackle flip and a zero rate. My question is will the front clear the firewall and How much fender trimming is necessary? I want to run 38x11x16 Boggers. Thanks for your input.