I've been wanting to do a 4wd low launch for awhile now but I'm not sure how much stuff i will screw up lol Would anything break? My truck is ALL stock with stock size tires and wheels.

4LOW?? I can just imagine the things that will break. 4LOW is geared really low. You could snap a front shaft or even cause damage to the TC itself.

To best simulate the feeling, back the truck straight in to an immovable object at 5 mph (concrete walls are great for this). It will probably do less damage too.

Truth be told however, assuming the drivetrain survives the launch, it will be winding a 315hp v8 through 4 gears within 40-50mph. I don't even know that the engine and transmission could keep up.

The only experience I have in this area is 195hp of Vortec V6 in my mom'* '95 blazer. Even then, downshifting to first in 4 low is like hitting a brick wall, and that is just from idle in second.

It really is a very bad idea, but if you decide to do it, please take a video of it, because youtube needs more fodder, and I enjoy a good carnage show.