If it's a non-synchro original tranmission, I believe there are three parts to the speedo drive. One bolts into the drivers side and holds the shaft in place. Remove that and the shaft should slide free. There should be an identical plug on the passenger side of the transmission that comes out, the end of the speed shaft sits inside the center of it. I don't know if you have to unbolt that part on the passenger side. It looks just like a big bolt head.
That should fix it, but as 3B mentions, I can't remember if it needs to come out or not to pull the yoke!
Jeff
