'39 transmissions are getting more difficult to find, but not impossible... " '39's " have the better case and the better double detent shifter housing and the bigger forks. '39 was also the last year for the "top loader" style case, in cars that is... The later '40-'48 car transmissions were effictively the same trans just in a "side loader" (column shift) configuration. Now.... In trucks they used the " '39 " top loader style trans for quite a bit longer. Some were open drive and didnt use a torque tube, But the case and the double detent top were the same! These are usually easily identified by the back open drive area. These are usable for a donor case. All the guts except the syncronizers are absolutely useless. The Ratio sucks and the main cluster is only for an open drive trans. These arent very desirable to most people and can usually be picked up fairly reasonable. Keep your eyes peeled for a good usable side shift trans preferably from a '46-'48 car. They had a good close ratio. Not Zephyr close, but the next best thing. With one of these and an open drive trans, or a good case and top you can build a damn good very reasonably priced trans. If lookin at bare cases keep an eye out for ones with the casting number "78" on the bottom. The web in the bottom is thicker, and they are a better case. Odds are you wont need one for a Model "A" though... Hope this helps!