273 904 Transmission Help 1964 or 1965?

Once you know the numbers they can be looked up in various books that will tell you the answer. Many folks on here, including me, can help you with looking that up.
Here are some numbers on the left side just above the pan. :thumbsup:

2C8C728E-8991-46C7-ACF6-72D3345A2BF7.jpeg

2792D003-E72D-4E1B-BDE7-C955B63BE824.jpeg

EC07B762-5361-46C2-9EA9-82B3D13400C0.jpeg