This view showing machine work on transmission splines I believe is in factory #05 but could possibly be factory #31. My knowledge of transmission work in the fifties is sketchy at best. I know that old #40 south of Leith st was building the Syncromesh while #10 was building the Dynaflow. I’ve driven a 1955 and 1957 Buick and believe me they were pretty incredible. Buick was the main experimental location for automatic transmissions dating back to the early thirties. During one fiasco that Detroit forced on them, it nearly ruined Buick with a loss of over 80 million dollars. My Powerglide in my 66 Caprice doesn’t come close to having the smooth shifts of the Buick during the fifties, but is more dependable.