It's on ebay. The plans I mean, for $15.00. Downloadable via emailed zip file. He has CAD plans and parts lists. His site is www.personaltrackedvehicle.com
Northern Tool still has diffs: http://www.northerntool.com/shop/too...ct_35768_35768
'12 Ram 2500, Cummins, 6-speed auto, Laramie Longhorn, RamBox that XXMe is having dirty thoughts about.