GM should have made a syclone/typhoon out of these but never did.  Start with a 4wd version, lower it and add the transfer case from a Bravada or AWD Astro.  Maybe add the appearance package from thier "xtreme" truck.  Drop in your LS2 and maybe a 100hp shot.  Doing this with an automatic would be easy but I'd love to see it done with a T56.