I have a 1940 Ford coupe with a TH-350 tranny; the speedo quit working the other day so I disconnected the speedo shaft from the tranny and put a electric drill to it to determine if the speedo was at fault, or the tranny cable at fault. To my surprise, the speedo worked with the drill. My next step was to pull the speedo gear (yellow) out of the tranny and it appeared to be in good shape so I removed the drive shaft and disconnected the tail shaft housing to examine the (orange) speedo drive gear. It too looked to be in good shape. I replaced the end seal and put all back together and test drove the car, with no speedo registering. What to do now?