I had a 93 F350 4X4 with a 460 and a C6. The transfer case was bolted to the transmisson. I believe that Ford did not change the C6 very much after the mid-80's, so you may have a wide range of years for your donor parts. I suggest asking at your local junkyard. We have a yard near here that can tell you if something will fit, and what small modifications will allow you to use something the book says won't work.