GM Saginaw OD transmissions produced in the late '70s and early '80s were made from the 4spd standard transmissions and used the configuration I described above. There were also similar produced by Chrysler. As I said in my previous post, I worked on several of these when I worked for GM, Chrysler, and in the independent general repair and the transmission repair industries.
My mistake if all of this discussion is concerning earlier transmissions with added overdrive units. I'm aware that there are other OD units that were added to earlier standard 3spd transmissions, but I thought you were talking about more modern units.
I also was involved in the Doug Nash overdrive units and early R&D related to their installation and in early repair and modification of the early GM automatic overdrive transmissions in the late '70s and early '80s.
Last edited by Blackwater; 12/10/18 12:49 AM.
