Hy Lockland41, I did some research on your question, but it just brought up more questions. According to my books the "T" designation ended in 1938, in 1939 they started with "AC" for conventionals and "AF" for cabovers. My Motors manual does not correlate models to engines, and I have very poor research material for pre 1939, but I would say that your truck is a 1938 at the newest, at least from what I can find, hope that helps.