travis87

Just an opinion but I would go 6" if your gonna put 35's on it. With a 4 inch you won't be able to run any negative offset to give the truck a good stance. You will have to run a 0 offset or plus.

bbs25

I have a 6" bds kit with 1" spacer on top the coil I run 35' on 20x12 -44 offset no rubbing at all and very wide stance.

boomer85

Zone n BDS each come with a free 5 year 60k mile power train warranty. BDS also has a lifetime lift warranty no questions asked. Something to think about as the warranty definitely saves my butt. Go 6" because you'll never say I wish I'd went smaller. I've got a 6" with 35s and everyone but my 3 year old gets up in it by themselves the 4 year old is pretty comical to watch lol

boomer85

6 year old helping me see the look of the flares before the install lol.

ARS1

I will probably be going with stage3's 8" lift like they used on the project 2012 FX4. It's a Zone based kit with coilovers and some additions that seems like it works really good. For the price it's worth looking into IMO. I want mine as high as I can go without the $10k price tag and they quoted me $2200 with all the upgrades available shipped to my door... Was going to do the Fabtec but they only go 6" and Zone is owned by BDS so you cant go wrong there.