I am using it in my car and had to add a second computer to control it, a 91' passenger side axle, and modify the passenger side tranny mount. It is out of a 1996 Park Ave Ultra. There was not 4t60-HD, only a 4T60E-HD started in 96, and ended when the 4T65E took its place. Also the 96' 4T60E is a direct bolt on for the 91' Reatta. Here is a link to ID the trannys. Once again the HD started in 96' http://dtcc.cz28.com/transmission/index.htm