There are a few guys on the board that have lifted AWDs and I believe they used the Ranger kits by Superlift and Trailmaster and modified them a little. Other than the transfer case I think the driveline in an AWD is the same as a 4x4 so any kit should work. Mine has air-ride so I'm not sure how that would work but...
When I get new tires I think I'm going to torsion/shackle lift mine (if I can get around the airbags) and put 265/75/16s (32") on.
Here's the install of one of the AWDs (stadx2):
Dead Link Removed