Also, the stiffer your front springs are on a 4x4, the least likely you are to need a sway bar. I see and hear some of these 4 and 6 lift springs seem pretty stiff. Coil spring front end like a 2wd, I'd for sure keep or add a sway bar if you didn't get it. But also in those 2wd trucks you're not lifting it, and not worried about articulation.
For those who don't know, NO not all squares came OEM with a sway bar. The holes are there to easily add it, if you want grind the rivets off another truck to get the brackets and rob the sway bar. I did on one of the trucks I scrapped cuz one of the half tons didn't come with a sway bar and I intended on adding it. I think now its time to put in on CL with all the brackets and hardware.