xb4 to 2wd help

[alex97]

hello
I hope that every one has had a happy xmas.

I got an xb4 2014 and I know that they do work very well in 2wd form but I was wounding how you do Ato make them 2wd ? and is there anything that I will need to change set up wise ?
I was also wondering what grip level astro is as I haven't finished setting it up so I hope that I am doing it right lol.

thanks alex