Just completed a 727 Torqueflite overhaul with a few mods from a TCI kit. It's been 40 some years since I've had one of these apart ,but most of it came back. Upon completion including "air checking" all seemed well. The problem began when I slipped a spare slip yoke into the extension housing and realized that it will turn only one direction in neutral , but not the other. Disassembly for a second inspection found no apparent problems. Ant thoughts will be greatly appreciated !