2001 GMC 1500 ex cab build (need help)?

2001 2wd GMC Sierra 1500 Ex. Cab 5.3L 4L60E Its getting lifted. I plan a Fabtech 7.5" Kit and a 3" Body lift. 38" all terrains. I know everybody is gonna say dumb idea for lifting a 2wd, but I got a Yukon on 39.5s so hints why this is a 2wd pavement pounder. here a couple things i have in mind: AEM intake, Superchips Cortex Programmer, B&M shift kit, added trans cooler, electric fans, and a couple other things the trans cooler and fans are foor reliability as i run from texas to mississippi quite often. but I need help on should i do the fans and cooler, gear choice 4.56 or 4.88, it will have straight exhaust from the cats back, and anything that would help with mileage( im not expecting magnificent mileage but just more than like 14MPG. and any more performance upgrades that should be addressed or any issues that need to be addressed. any pointers, suggestion, tips just help in general would be appreciated.