[paul]

I removed the speedometer drive gear from my aluminum T-10 beacause it was the wrong gear. The grooves on this wrong gear lean the opposite way from the grooves on the correct 4 speed gear now installed. This old drive gear moved the speedometer needle only when the car was going backwards. I think this incorrect gear is used in a transmission that has the speedo cable entering on the driver's side (not Mustang/Shelby) or a car that has a speedometer that indicates in reverse(right to left vs left to right). Any idea what the gear comes from? It is a metal gear pressed onto the tail shaft and is slightly smaller in overall diameter than the correct gear, Paul.