Do you want to put one together? I have a good 3.78 ring and pinion and the rest of the rear end from a 38 Ford with a broken gear set. Located in Cedar Rapids, Iowa.
I have a complete rear end for a 40, even has the spedo gear. I'm located in Lafayette In. Would take 150 for it. Let me know if you are interested and I can take some pictures and perhaps pick a time for you to come and get it. cbunnell@comcast.net