so their SAS kit is $2400 (i think) then you'll need front coilovers at $1500-1700, a front axle that is an appropriate width. lets say a ABS compatible Currie F9 with one-ton outers, high pinion 3rd member on 6 lug and a locker - $7500 shipped. and then various extras you will need like brake lines, ABS extensions, DOM tubing for steering ETC $1000 and then the grand finale of PSC or Howe Hydro-Assist steering in the front, $1500.
so the front suspension alone on an SAS if yo do it right, out of the box is somewhere north of $10,000, plus then you have a gimpy rear axle and suspension you need to address. crate rear axles in the one-ton flavor are about $3500 ABS compatible. and since you're slinging big axles underneath it you might as well cut off and redo the entire rear suspension too with a double triangulated rear.
lets just stick a $15,000 sticker on a crate ABS compatible SAS one-ton axle swap package for the ability to run up to 40" tires effortlessly with 12-16" of travel in each corner. assuming you know how to drive and rock crawl - your $15,000 ticket just made you a rock god
now on the flip-side you have front L/T which with comparable coilovers and bump stops. say $6500 for a working 4wd front suspension with some durability enhancements. then you'll need a rear suspension to properly keep up with the font suspension, so throw another $2000 at that and some link upgrades. and then when your OCD gets the best of you from your front suspension being 7" wider overall, you'll need a $3500 rear axle to match it. your front L/T is realistically limited to 35" tires at that with 12-14" of vertical travel.
so really - to do it 100% the right way on both fronts you're looking at over $10k