Can't believe I've turned into a "Search Nazi"... But, search the forum... If you can't find it here, try Yotatech, if you can't find it there, try google... If you can't find it there, then ask...
I just did a full LC coil/BJ Spacer lift & didn't have to ask a single question... All the info is here or Yotatech or 4crawler (and other great websites) or google!
Short answer... No, you don't HAVE to.
Long answer... If you plan to do anything other than mall crawling, and want a nice ride, then yes, you better get new shocks to match the lift. As far as anything else, Search...