First, welcome to WF!
Next, don't even THINK about installing a 3" body lift. A 1" body lift is fine, a 2" is ok too but only if absolutely necessary. There's never a good enough reason to install a 3" body lift though. They cause shifting problems for both the transfer case and transmission, you need longer fuel lines, the front steering shaft geometry will get jacked up, and you'll suffer a lot of ridicule from experienced Jeepers who typically equate them with a clueless newby.
Don't do it.