Pulling the transmission…

[HDowse]

The '39 transmission in my '37 pickup is coming out for a rebuild. The early style synchromesh has quit and it pops out of second gear. None of that is a concern since I have Mac Van Pelt's book and catalog and I enjoy doing this sort of work. BUT when I pulled the rear axle/torque tube back to make room to remove the transmission, I saw the speedometer gear looking at me at the front end of the bell on the end of the torque tube. When I spun a wheel, the driveshaft didn’t move until I pushed it back rearwards and it reconnected. Mu guess is the driveshaft pin fell out or was never put in. Another factor has been a clunk when I change from forward to reverse or vice versa. I was hoping it was the universal joint but now I think it’s the driveshaft at the differential. So, long story but what does this sound like? With the rear end loose I'll pull it all the way out, remove the torque tube and see what’s up. I hope I don’t have to get into the pumpkin but it is winter and the shop is warm. Thanks for any suggestions.