I am using my stock automatic 5.3 harness. I used kysilverados 80e swap thread for the wiring from pt.net. My Front driveshaft is a stock reg cab short bed shaft. The key to the input gear is machining "I think". The only way I know for sure that it will work is the input gear from timetokill on sivlerado ss .com He works for the company that machines the input gear. I think they have a salvage yard also. My rear driveshaft is custom from http://www.pstds.com/. Hit me up if you have anymore questions. My memory is real fuzzy on it right now. It has been a while since I did the swap and I was not the mechanic for the job. I just got the information for my technician.