I have picked up a 1988 motor and trany from a friend of mine I plan on using it in my off road dune buggy. But it is set-up for 2x4 and I would like to transfer it over to 4x4 I am trying to track down the necessary parts such as a transfer case and such.

If you could point me in the right direction thanks!

 

You may want to start searching threads related to maybe "Rotary Samarai or Suzuki Rotary" Or if the Mazda B series trucks came withe 4x4 you could look at that type of trans.
Lots of guys have done swaps like that.(not 4x4 so much though!)