Thank you so much for your reply. It is an 18 spline input shaft. I am not seeing a flat machined plate on the right side of the trans. I did find some more cast numbers on the bottom of the trans: There is a C-96707J and what looks like E3 then below that C-87622 on the output side. There is also grease pencil writing on the side that says Cornet Rebuilt, but I don't really trust whatever was written on there 20 years ago at a swap meet. Thank you so much for the help.