google is your friend
There is some info stuff on E bay on warner overdrives. I don't know if yours was manufactured by or under borg warner's patent. There were 2 common overdrives, a 3 planet and the heavier 4 planet, depending on which car company, or engine was used. My old college Auto engineering text books are down south at our winter home. We came back north for thanksgiving and Christmas then will go south again.