Yup, a '39-'40 has a 1-1/2" shorter wheelbase than a '41-'46, so the driveshaft length might be just right. On Joe's '37 the wheelbase is 1-1/2" shorter yet, so I wonder if he had to shorten the driveshaft then? I know he told me at one time, but I forget. You got your ears on out there Joe? Can you add to this?